P0171 Cruze? (TOP 5 Tips)

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  • What is the P0171 code for the Chevy Cruze? The P0171 code indicates that the fuel system in part of the engine is running weak or there is a vacuum leak near that side of the engine. This happens when the engine is getting too little gas or too much air.

How do I fix the code P0171 on my Chevy Cruze?

What Repairs are Needed to Fix a P0171 Code Issue?

  1. Replacing the fuel pump, fuel filter, or fuel pressure regulator.
  2. Fixing a vacuum leak, mass airflow sensor, or the oxygen sensors.
  3. Replacing one or more fuel injectors.
  4. Replacing the powertrain control module.

Can a bad PCV cause P0171?

The most common causes of the P0171 code are vacuum or intake leaks, low fuel pressure, faulty PCV valve, or a faulty MAF sensor. Other things can also cause the P0171 code.

Where is Bank 1 on a Chevy Cruze?

The bank 1 sensor 1 location is the sensor on the catalytic converter. If the car is having issues with the catalytic converter then it will cause a number of issues. The most obvious one that You will notice is black smoke coming from under the engine hood.

What causes po171 code?

This can be caused by something like a disconnected hose or vacuum leak, which means there’s more air than usual, or because your fuel system is weak. P0171 is a common trouble code in many vehicles. If there is too much air, the ECM or PCM overcompensates with larger fuel injections, which triggers the P0171 code.

Does a 2012 Chevy Cruze have a fuel filter?

The 2012 Chevy Cruze 1.4 fuel filter can be found in the fuel sending unit that is located in the gas tank. The fuel filter is used to prevent debris from getting into the fuel lines and then into the injectors. This helps protect Your engine and the rest of the fuel system.

What is a P0171 code for a Chevy?

What Does P0171 Mean For Your Chevrolet? Combustion engines run most efficiently when they maintain an air-fuel mixture ratio of 14.7 parts air to 1 part fuel. When there are more than 14.7 parts air to 1 part fuel in the air-fuel mixture, a lean condition exists and code P0171 is triggered.

Can a bad O2 sensor cause a P0171?

A P0171 or P0174 lean code with an O2 sensor reading lean all the time mean — well, several things. The real problem may not be a bad O2 sensor, but possibly be an engine vacuum leak, low fuel pressure or dirty fuel injectors that are causing the engine run lean.

Is a P0171 code bad?

The OBDII trouble code P0171 – System Too Lean (Bank 1) means that the engine air-fuel mixture is too lean, or there is too much air and too little fuel. Driving a car with the code P0171 can cause more damage to the engine over time, as when the engine runs lean, the combustion temperature is higher.

Is it safe to drive with a P0171 code?

It is okay to drive a vehicle with P0171 for a short period of time, but driving with this code for an extended period of time can overheat the engine and cause internal engine damage.

How can you tell if an oxygen sensor is bad?

Here are some of the most common signs that your oxygen sensor is bad.

  1. A Glowing Check Engine Light. The bright orange Check Engine light in your dashboard will usually glow if you have a bad oxygen sensor.
  2. Bad Gas Mileage.
  3. An Engine That Sounds Rough.
  4. An Emissions Test Failure.
  5. An Older Vehicle.

Can you clean O2 sensors?

There are no true oxygen sensor cleaners that are safe to put through your engine. While some people choose to remove them and use a wire brush or an aerosol cleaner to remove deposits, we do not recommend trying to clean O2 sensors.

What is code P0137 mean?

What Does P0137 Mean? Oxygen sensor 2 is the downstream oxygen sensor in relationship to the catalytic converter. When trouble code P0137 is set, this indicates that there is low voltage (roughly 450 millivolts or less) for more than 20 seconds coming from the bank 1 sensor 2 oxygen sensor.

How do I fix code po171?

What repairs can fix the P0171 code?

  1. Replacing the fuel pump.
  2. Replacing the fuel filter.
  3. Replacing the fuel pressure regulator.
  4. Replacing the powertrain control module.
  5. Replacing one or more injectors.
  6. Replacing one or more oxygen sensors.
  7. Replacing the mass air flow sensor.
  8. Repairing a vacuum leak.

Can a bad air filter cause P0171?

If the filter is clogged or excessively dirty, this is enough to impede or restrict the air flow, hence resulting in a lean running condition. Besides a dirty air filter, the P0171 code can also be blamed on a dirty or faulty MAF sensor and a clogged fuel filter.

Can bad fuel injectors cause P0171 code?

A leak that causes diagnostic trouble code P0171 could be anywhere around the engine intake, including the PCV hoses, vacuum hoses, and the intake manifold gasket. A weak or failing fuel pump won’t push enough gasoline to the engine. Clogged fuel injectors or a dirty fuel filter will cause a similar backup.

Chevy Cruze: What is the P0171 Code?

What does it signify, why is it on, and how can you turn it off and on again? No need to be concerned, as we will explain in further detail below. What is the Chevrolet Cruze’s P0171 diagnostic trouble code? The P0171 code indicates that the fuel system in a portion of the engine is operating weakly or that there is a vacuum leak near that portion of the engine, according to the manufacturer. This occurs when the engine receives either too little gas or too much air, respectively. Let’s take a look back at the Chevrolet Cruze’s history.

What it implies, what causes it, what symptoms it exhibits, how severe it is, and what steps must be taken to correct it are all discussed.

A Little Chevy Cruze History

TheCruzeis a tiny automobile that first appeared on the market in 2008 and has been in production worldwide since 2009. In 2010, this car took the position of the Chevrolet Cobalt. A four-door sedan, it was also offered as a five-door hatchback in 2011 and as a station wagon in 2012. It is currently only available as a sedan. Unfortunately, Chevrolet discontinued manufacture of this vehicle in the United States and Mexico in 2019. In other regions of the world, however, it is still made and marketed as a result of this.

A More Detailed Explanation on What the P0171 Code Means

Over time, your vehicle’s engine may suffer from wear and tear, and it may not be able to accurately measure the sensors in certain situations. When this occurs, the vehicle’s computer will make adjustments to the fuel injectors to ensure that the mixture of fuel and air is more evenly balanced. The P0171 System Too Lean Bank 1 error code will be shown as a result of this problem. When the P0171 code is displayed, it is possible that the P0174 code will also be displayed. This code is also used to identify Bank 2 as being in a lean state.

This combination of the two banks is what allows your car to get greater gas mileage, perform better, and emit less pollution during the combustion process than it would otherwise.

What are the Causes of the P0171 Code?

There are a variety of factors that might cause the P0171 error code to display on the screen. And such issues may arise on either side of the combination, i.e., there could be insufficient gas or too much air.

  • A vacuum hose that has ruptured, resulting in a vacuum leak
  • A faulty fuel pressure regulator, a weaker fuel pump, or a blocked fuel filter are all possible causes. A faulty mass airflow sensor or an erroneous oxygen sensor Fuel injectors that are clogged or faulty
  • A malfunctioning powertrain control module
  • There is a leak in the exhaust system.

Vacuum leaks caused by a ruptured suction hose Bad fuel pressure regulator, weakened fuel pump, or blocked fuel filter are all potential causes of engine failure. Incorrect readings from the mass airflow sensor or oxygen sensors; Fuel injectors that are clogged or have malfunctioned. Powertrain control module that is not functioning properly; There is a leak in the exhaust;

What are the Signs of a P0171 Code Issue?

Your Chevrolet Cruze is most likely suffering from a P0171 code problem if you observe any of the following symptoms:

  • Power loss, engine reluctance, or engine stalling are all possible outcomes. A check engine light is illuminated
  • The engine is coughing or misfiring
  • And other symptoms are present. The car has a rough idle and is difficult to start. The catalytic converter has been damaged.

What is the Level of Severity for a P0171 Code?

The P0171 error code is regarded as a significant problem. That implies that if you see a P0171 code on your dashboard, you should take your automobile to a mechanic as soon as possible to get it diagnosed and fixed. While it is acceptable to drive your vehicle for a short length of time while the P0171 code is displayed, you should not leave it for an extended period of time without having it serviced. For example, you should only drive your automobile in this manner until you can get it home and to the garage.

If you continue to drive without addressing the issue that is producing the P0171 code, you risk do more harm to your vehicle.

For example, whatever is causing the problem might cause your engine to overheat, which could result in internal damage to your vehicle. Therefore, it would ultimately cost you far more in repairs than it would have if you had taken care of it right away. So don’t put it off any longer!

What Repairs are Needed to Fix a P0171 Code Issue?

The mechanic’s findings about the P0171 code, which might include any of the following, will determine the course of action to take.

  • It is necessary to replace the gasoline pump, the gasoline filter, or the gasoline pressure regulator. repairing a vacuum leak, a mass airflow sensor, or oxygen sensors
  • And Changing one or more of the fuel injectors
  • The powertrain control module must be replaced.

How Much Does it Cost to Repair a P0171 Code Problem?

It is necessary to replace the fuel pump, fuel filter, or fuel pressure regulator. The repair of a vacuum leak, a mass airflow sensor, or an oxygen sensor; Changing one or more of the fuel injectors in the vehicle The powertrain control module must be replaced;

A Common Chevy P0171 Code Diagnosing Mistake to Avoid

The full P0171 diagnostic process should be completed before any parts are replaced if you have opted to try and diagnose your own problem with a P0171 error code yourself. Here is an example of a typical diagnostic error that you should avoid. In the case of a faulty air fuel sensor or oxygen sensor reading, you don’t want to immediately assume that this is the source of the problem and replace the sensor right away. This is due to the fact that sometimes the true problem is just a filthy or faulty mass airflow sensor.

As a result, changing the air-fuel sensor or the oxygen sensor will not solve the problem, and you will have wasted your money in the process.

Conclusion: If you do not have the necessary tools and skills to diagnose and repair this problem, it is preferable to take your vehicle to a mechanic who will get it fixed correctly the first time.

What’s Next?

In the event that you have decided to attempt to diagnose the P0171 code issue on your own, you will want to complete the entire P0171 diagnostic process before replacing anything. A common diagnostic error that you should avoid is as follows: In the case of a faulty air fuel sensor or oxygen sensor reading, you don’t want to immediately assume that this is the source of the problem and replace the sensor. Due to the fact that a dirty or faulty mass airflow sensor may be the real culprit in some cases, In some cases, a vacuum leak may be the source of the difficulty.

In addition, you will have to start the entire diagnostic and repair process over from the very beginning again.

P0171 Chevy Cruze Diagnosis and Explanation

The P0171 error code is one of the most often seen when driving a Chevrolet Cruze. This code number refers to a number that you will be issued when you put your automobile into an OBDII scanner for the first time. P0171: Lean Bank 1 of the Fuel Trim System. You may learn more about what is causing the P0171 code to be shown on your Cruze by watching this excellent YouTube video.

Cruze P0171 Code Defined

The P0171 error code is one of the most often seen when driving a Chevrolet Cruze.

This code number refers to a number that you will be issued when you put your automobile into an OBDII scanner for diagnostics purposes. Input Lean Bank 1 (P0171) for the Fuel Trim System Discover what’s causing the P0171 code to be shown on your Cruze by watching this excellent YouTube video!

Cruze P0171 Code Symptoms

When the fuel injection system in a Chevrolet Cruze is not functioning properly, the P0171 code will frequently display. Most of the time, a lean state in the engine will cause the code to be executed. P0171 is not normally related with any drivability concerns, although it can be. For the vast majority of individuals, the appearance of the service engine soon light is the first indication that anything is amiss. When you have code P0171, the following are the common signs that indicate that something is wrong.

  • Mileage-depending on how much the air-fuel combination has altered, mileage may or may not be affected. Misfire – If the air fuel mixture has deviated too far from the manufacturer’s specifications, the Cruze may misfire. Car Idling Issues — When the air/fuel mixture is changed, the vehicle might idle erratically while the computer adapts in order to keep the engine operating.

Top Chevy Cruze P0171 Causes

According to how much the air-fuel mixture has changed, mileage may or may not be affected. Misfire – If the air fuel mixture has deviated too far from the manufacturer’s specifications, the Cruze may misfire; Car Idling Issues — When the air/fuel mixture is changed, the vehicle might idle erratically while the computer adjusts to keep the engine operating.

  • Vacuum Leaks — With the Chevrolet Cruze, one of the most prevalent reasons for the P0171 code to appear is a vacuum leak, which is listed as one of the most common causes. Take a look around to see if you can locate the source of the vacuum leak. Listed below is a fantastic YouTube video on how to locate a vacuum leak
  • Oxygen Sensor – The P0171 code is generated when the oxygen sensor(s) in the exhaust system does not detect enough oxygen in the exhaust system. When the oxygen sensor is malfunctioning, it might result in an erroneous reading and the occurrence of the code. The computer will still make adjustments to the air/fuel combination to compensate for the loss of pressure. The Cruze will get too wealthy as a result of this. Affordability is a major advantage of oxygen sensors. In the engine, the mass air flow sensor estimates the amount of oxygen that is being drawn in through the intake. If it has failed, the air-fuel mixture will be incorrect, and the P0171 error code will appear. Unhealthy Fuel Injectors – If you have one or more fuel injectors that are no longer working properly, this will almost surely result in the air/fuel combination being unhealthy. A high level of fuel pressure is required for today’s sophisticated fuel-injected motors in order to adequately atomize the gas. Fuel pump/fuel filter If the fuel pressure is not as high as it should be, atomization will not occur effectively, and the appropriate air/fuel combination will not be obtained. Air Filter – While it is not the most prevalent reason for the P0171 code to be shown, a blocked air filter can certainly result in the code being displayed. In addition, because it’s so simple to do so, why not do so?
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Hopefully, you will be able to figure out what is wrong with your Cruze. If there is anything that you believe may be improved upon in the post, please do not hesitate to comment or mail me about it. Thank you very much.

What Is a Chevy Cruze P0171 OBDII Code and What are the Fixes? – BackYardMechanic

The Chevrolet Cruze is a fantastic car, but it does have some troubles from time to time, particularly as it matures. One such issue is a P0171 OBDII Code, which is generated when the air/fuel ratio is incorrectly calculated. When there is too much air in the system, the engine will run lean, and when there is too much gas in the system, the engine will run rich. Several components, including injectors, sensors, and the onboard computer, are responsible for controlling the air-to-gas ratio (ECM).

  • In a Chevrolet Cruze, what is the meaning of the P0171 OBDII code?
  • In this case, the onboard computer (ECM) determines that the air/fuel ratio is incorrect and displays an error message.
  • A variety of factors can result in a P0171 OBDII code on a Chevrolet Cruze, as shown in the list of causes and solutions below.
  • Fix1 With a P0171 code, a vacuum leak is a relatively frequent problem, and it’s easy to diagnose.
  • Finding a large vacuum leak is typically simple because it can frequently be heard, but finding a small vacuum leak might be more difficult.
  • Aside from that, there are some old-fashioned backyard mechanic methods, such as spraying a can of starting fluid on a specific region to check whether the engine’s idle changes.
  • Fix2PVC ValveA leaking PCV valve is a typical problem on Chevy Cruzes, and it can result in the P0171 code being displayed.

When it comes to the Chevrolet Cruze, the PCV valve is housed within the valve cover.

Example Valve Cover for a Chevrolet Cruze with a PVC Valve Amazon has a built-in feature.

OE 25198874 55573746 25198498 55573746 25198498 Troubleshooting3Bad Oxygen Sensor There are two types of oxygen sensors, which are referred to as upstream and downstream.

If a sensor is malfunctioning, the data being transmitted is incorrect, which might result in a lean.

Sensor for Mass Air Flow (Fix4) A faulty or filthy mass airflow sensor (MAF) can potentially result in malfunctioning.

Of course, it is possible for it to become faulty and require replacement.

The fact that they have become blocked or are not spraying gasoline effectively might create a concern for the operator.

Due to this, the fuel/air ratio will become unbalanced, and the ECM will display the P0171 error code.

An inoperable fuel pump will often not provide any fuel, resulting in the automobile failing to start.

It’s possible that the gasoline filter is preventing furl from going through.

Frequently, if the air filter is really unclean, it might result in other problems, such as the MAF sensor being dirty as a result of the contamination.

Some automobiles will be driveable, while others will not be. It will be determined by how badly the air/fuel ratio is wrong when determining how poorly the automobile runs. If it is still driveable, it is likely to deteriorate further and should be repaired as soon as feasible.

Code P0171 – System Too Lean: Symptoms, causes, common problems, diagnostic

The most recent update was made on July 10, 2021. It signifies that the engine air-fuel mixture is too lean, or that there is too much air and not enough fuel, according to the OBDII fault codeP0171 – System Too Lean (Bank 1). Driving a car with the code P0171 can cause greater damage to the engine over time, since when the engine runs lean, the combustion temperature is higher, which can lead to additional damage.

Symptoms:

July 10, 2021 is the most recent update. It signifies that the engine’s air-fuel mixture is too lean, or that there is too much air and not enough fuel, according to the OBDII error codeP0171 – System Too Lean (Bank 1) It is possible to do greater harm to an engine by driving a car with the code P0171 over time, since when an engine runs lean, the combustion temperature rises.

Causes:

The following are examples of common causes:-Vacuum leaks – A clog or a defective valve PVC valve or other sections of the PCV system that are faulty – Purge valve or solenoid that is stuck open – Mass Air Flow Sensor (MAF) The oxygen sensor was faulty, and the aftermarket intake was improperly placed. – Insufficient fuel pressure; clogged catalytic converter.

How the code P0171 is diagnosed:

Leaks in the vacuum system are among the most frequent reasons. – A clog or a malfunction PVC valve or other components of the PCV system that are faulty – Purge valve or solenoid that is stuck open – Faulty oxygen sensor-Inadequately fitted aftermarket intake system The following problems may occur: Low fuel pressure; Clogged catalytic converter

What is Intake or Vacuum leak?

An air leak that occurs somewhere between the engine’s intake and the mass air flow sensor is referred to as a ‘vacuum leak’ or a ‘intake leak,’ respectively. A ripped or broken intake boot, leaky intake manifold gaskets, a stuck-open or malfunctioning PCV valve or a shredded PCV hose, a cracked or disconnected vacuum line are all instances of vacuum leaks that can occur. Continue reading:Vacuum leaks: frequent causes, symptoms, and solutions. Some instances of intake or vacuum leaks include the following:

Common problems causing the code P0171 in different cars:

Searching for technical service bulletins for your particular make and model is one method of discovering a typical problem with your vehicle (TSBs). A leaky intake manifold gasket in subfreezing temperatures, according to the Toyota Technical Service Bulletin (TSB) EG045-07 for the 2003-2008 Toyota Corolla and Matrix with the 1ZZ–FEengine, is one probable cause of the code P0171, among other reasons. If the leaking manifold gasket is determined to be the result of the diagnostic procedures, the gasket must be replaced.

  • Ford has published a technical service bulletin in response to this situation.
  • This is a well-known problem with Ford vehicles.
  • In many BMW automobiles, a fractured or torn intake boot is a typical cause of the code P0171, which is shown.
  • Another Ford Technical Service Bulletin for a variety of Ford cars from the late 1990s details a problem with MAF sensor contamination in which both codes, P0171 and P0174, might display simultaneously.
  • Sometimes the mass air flow sensor simply becomes dusty, resulting in erroneous air flow measurements and the engine operating at a lean state.

It is possible that cleaning the air flow sensor could assist temporarily; however, the true solution will necessitate replacing the malfunctioning mass air flow sensor. A scan tool may be used to evaluate a mass air flow sensor; further information can be found here: mass air flow sensor.

Basic car knowledge:how the air/fuel ratio is adjusted

Diagram of the Fuel Trim Control Modern automobiles equipped with the OBD-II system have a front oxygen sensor that measures the amount of oxygen in the exhaust gases and sends a feedback signal to the engine computer (PCM) indicating whether the air-fuel mixture entering the engine is lean (too much air and not enough fuel) or rich (too much fuel and not enough air) (too much fuel and too little air).

Accordingly, the PCM adjusts the fuel supply in order to maintain the air/fuel ratio at its optimal level, which is 14.7/1.

This is a constant process: when the oxygen sensor detects an excessive amount of oxygen, the PCM thinks that the air/fuel combination is lean and increases the amount of fuel.

In technical jargon, this modification is referred to as fuel trimming.

What isFuel Trim?

Short-term reduction in fuel consumption (STFT) A few minutes after a cold start, the front oxygen sensor is warmed up, and the engine computer (PCM) begins cycling the air/fuel ratio between a little lean and a little rich. It is estimated that this cycle occurs once or twice every second. Short-term fuel trim is the phrase used to describe this modification in the air/fuel ratio (STFT). Air fuel ratio (oxygen sensor) cycling may be seen on the graph here: air fuel ratio (oxygen sensor). In the Live Data mode, a common scan tool displays the STFT as a percentage denoted by the letters ‘-‘ or ‘+.’ Consider the following scenario: if your automobile had a slight vacuum leak, you would see the STFT increasing by 10-15 percent at idle and decreasing by 3-5 percent at higher rpms.

For example, if the engine progressively develops a minor vacuum leak over time, the engine will operate more efficiently as a result (more air and less fuel).

In a scan tool, the long-term fuel trim is also presented as a percentage with a ‘-‘ or ‘+’ symbol to indicate that it is negative or positive.

How thecode P0171 is set

Depending on which cylinder bank is affected, the engine computer (PCM) will illuminate the ‘Check Engine’ light (MIL) and set the trouble code P0171 – System Too Lean for Bank 1 and (or) P0174 – System Too Lean for Bank 2 if the air-fuel mixture becomes too lean and the engine computer (PCM) is unable to compensate for this condition by adding fuel. The PCM also retains the freeze frame of the parameters (engine temperature, vehicle speed, fuel trim readings, and so on) that were present at the moment the code was entered into the computer.

Code P0171 is often triggered when either the short term fuel trim (STFT) or the long term fuel trim (LTFT) adjustment exceeds a predetermined value (typically +25 percent) in the engine control module. More information about the frozen frame may be found here.

What does the term ‘Bank 1’ mean?

In a V6 engine, Bank1 and Bank2 are the primary banks. A different group of engine cylinders is denoted by the designations ‘Bank 1’ and ‘Bank 2.’ The majority of in-line 4-cylinder engines have only one bank, which is called Bank 1. V6 and V8 engines, as well as certain 4-cylinder engines, are ‘divided’ into two groups of cylinders; the Bank 1 group of cylinders is the one that contains cylinder number 1. For further information on which is Bank 1 and which is Bank 2 in your automobile, you may consult your repair manual or Google it, being sure to include the model year, make, and engine size of your vehicle.

A: The code P0171 in the 2002 Corolla is frequently caused by a defective or filthy mass airflow sensor, as well as vacuum leaks.

If the mass airflow sensor is the source of the lean situation, cleaning it may be beneficial, but it is more often than not necessary to replace it.

Check Engine Light Diagnostic Trouble Code Description

Detailed description:How does a P0171 code cause the check engine light to illuminate? This code will cause the check engine light to illuminate in the following ways: The adaptive fuel strategy in the vehicle’s computer continually checks the fuel delivery system to ensure that the engine is operating at the optimal air-to-fuel ratio, which is 14.7:1, according to the manufacturer. The computer regulates the amount of gasoline that enters the engine by adjusting the pulse width of the injectors.

When this information is interpreted by the computer, it may be utilized to assess whether or not more gasoline is required.

This loop will continue indefinitely as long as the engine is operational.

An engine light will illuminate when the computer has reached its rich calibration limit and is unable to supply enough fuel to maintain the proper mixture.

Possible Causes:

What causes a P0171 code to illuminate the check engine light is unclear. This code will cause the check engine light to illuminate in the manner described below. The adaptive fuel strategy in the vehicle’s computer continually monitors the fuel delivery system to ensure that the engine is operating at the optimal air-to-fuel ratio, which is 14.7:1, as specified by the manufacturer. It is the computer’s job to regulate the amount of fuel that is delivered to the engine by varying the pulse width of injectors.

This information is interpreted by the computer, which then determines whether or not more gasoline is required.

While the engine is operating, this loop will continue to repeat.

For additional information on this system, please see our article Oxygen Sensor Code Diagnosis. An engine light will illuminate when the computer has reached its rich calibration limit and is unable to supply enough fuel to maintain the proper mixture. The P0171 code is shown on the dash.

Diagnostic Help:

The following link is an extremely in-depth overview of how to approach and repair a P0171 check engine light code: Please let us know if you require any other support. Please return to our site and explore some of our other highly useful site features to learn even more about your car’s emissions system! Return to the Generic OBD II Code List after completing the P0171 page.

r/MechanicAdvice – 2011 Chevy Cruze – P0171 code – Where should I take it for repair? Dealer or Indie Mech?

I purchased my used 2011 Chevrolet Cruze a couple of months ago from a Mercedes-Benz dealership that was certified. The check engine light came on, and an AutoZone technician determined that the code -P0171- was most likely caused by an oxygen sensor failure. Do I take my Cruze back to the Merc dealer or do I take it to a generic auto repair shop instead? For Stupid Question Wednesday, I also posted this on the automobiles forum. To make a comment, you must first log in or create an account. 1st grade In the case of p0171, it’s nearly never an oxygen problem.

  1. It will either be a vacuum leak or a mass air flow sensor that causes the problem.
  2. I’m not going to take it to Mercedes until it’s still covered by the warranty.
  3. 1st grade If the item is still under warranty, the dealer will service it; otherwise, an independent shop will service it.
  4. P0171 is a condition that indicates that the system is too lean.
  5. It may be a MAF sensor, an oxygen sensor, or anything else, but it’s best to start with something simple.
  6. It’s possible that the problem is straightforward.
  7. I recently got the oil changed, and the CEL illuminated with the same code later that day.
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It was successful for me.

Before the final pick up, I’d forgotten that the dealer had changed the oil in the vehicle.

The light has been turned off after being unscrewed and re-screwed.

1st grade The most likely source of the vacuum leak is the valve cover on the upper right of the engine.

This is a common problem.

I double-checked the oil cap!

1st grade If it is still covered by any type of used car warranty, you will need to return it to the dealership where you purchased it.

level 1On the Chevrolet Cruze, there is a known issue with the PCV valve breaking and pulling air through the valve cover, which has been documented.

A new valve cover will cost you $55 and will resolve the P0171 error number. I created a video to demonstrate how to replace the cover. 2 Everyone who has worked on automobiles for a period of time is aware that a p0171 code indicates a lean condition, which is frequently caused by a vacuum leak.

P0171 Cruze

Service bulletins for these engines (PI0552, PI0850A, PIP5197E, and 03-06-04-030H) have been issued in a flurry to resolve several problem codes found in the cars mentioned below. Along with the P0171 Cruze and Encore TSB related changes, I’m included a few of more on this list: The codes that appear the most frequently are P0171, P0172, P0174, P0300, P1174, and P1175. P0171, P0172, P0174, P0300, P1174, and P1175.

Steps to diagnose P0171 Cruze , Encore

Considering that this is a lean code, you should always begin your diagnostic procedure by testing for UNMETERED air, which is defined as air that enters the engine but does not pass through the MAF sensor. Make a visual inspection for vacuum leaks and rips in the air duct that runs from the air filter box to the throttle assembly. To ensure that the oil filler cap is properly installed, double-check its position. Check to see that the oil dipstick is completely seated. Double-check the PCV hose for leaks or the presence of oil before driving away.

Design of the old PCV valve cover Design of a new PCV valve cover

Vehicles affected

2011–2014 Buick Encore 1.42011–2014 The Chevrolet Cruze 1.4 is a little car with a lot of character. Rick Muscoplat posted a blog entry on

2011 Chevy Cruze p0171 – ScannerDanner Forum

26 Aug 2018 23:51-26 Aug 2018 23:5422880byvb4me 26 Aug 2018 23:51-26 Aug 2018 23:5422880byvb4me 26 Aug 2018 23:5422880byvb4me Hello, everyone. Taking a look at a Holden(Chev) Cruze 2011 with the p0171 code. When the engine is running at idle, the fuel trims are Lt 30 St 9. When the revs are increased, these values drop down to a manageable level. So, assuming there was a vacuum leak, I turned on the smoke machine. There was a leak near the throttle body that was discovered. This was corrected, and the fuel trims were checked again to ensure the correction was successful.

  1. Despite the fact that there was no smoke everywhere, the gauge was still indicating a significant leak.
  2. It is the port that links via a corrugated hose to the turbo, which is, according to my knowledge, the pcv (performance control valve).
  3. Please log in or create an account in order to participate in the discussion.
  4. Cruze, there are just two alternatives available on the US market; I’m not sure what possibilities you’ll come across.
  5. One of my initial thoughts is that the PCV diaphragm in the valve cover, below the ridiculous small engine cover, has burst due to excessive pressure.
  6. To check that there is a vacuum leak, cover it with your finger.
  7. Please log in or create an account in order to participate in the discussion.

Sorry about the 1.4L turbo engine.

Position of the throttle while the engine idles is 4.26 percent Rpm 698 MAF 1.75g/s MAP 44Kpa.

Engine load is 19 percent, LTFT is 5.1 percent, and STFT is -3.5 percent.

Due to the fact that the MAF signal is frequency based, the 4 Volt test at WOT was ineffective; however, I did get a pleasing frequency rise at WOT.

Redid the smoke test, this time using the brake booster port on the manifold, and got the same results as before: no visible smoke, but plenty of flow and no pressurization.

I hope this has been of assistance.

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If this is the case, it may explain why you aren’t generating any form of pressure.

Install the intake tube and tighten the clamp once more.

Instantaneous seal.

These valves are notorious for flowing wrongly when commanded open, and General Motors prefers to run the purge when the engine is running at idle.

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However, you should have anticipated the short-term decline.

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Because the seal was not excellent, the intake was additionally sealed with a rubber glove.

I’m going to try the purge valve.

I won’t be able to view the car for a few days, but I’ll keep you posted.

on the 4th of September, 2018 at 03:2323063byvb4me Tyler You were the one who said it, dude.

When the purge valve is disconnected, the trims begin to fall away to a more appropriate level for the situation.

There is no way I could have predicted it based on the data, but a little prodding in the proper direction, followed by a simple unplug it test, and Bob’s your aunty is back in business!

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Valve for purging the system.

Not perfectly, mind you, but at a level that will not cause a dtc or cause harm to the automobile to occur.

GM simply can’t seem to get the purge valves to work properly.

Given the facts, there is no way I could have predicted that, but a little prodding in the correct direction and a simple disconnect it test and Bob’s your aunty.

Wow, I’d never heard that one before!

4th of September, 2018 15:2123078byvb4me Tyler You were the one who said it, dude.

When the purge valve is disconnected, the trims begin to fall away to a more appropriate level for the situation.

Nice!

If you do decide to replace it, please let us know where you wind up getting your trims from.

I normally simply diagnose problems, although I will occasionally perform minor fixes.

Thank you, mate.

I think it’s a bit of an Australian thing.

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The purge valve has been changed, and the fuel trims are perfectly perfect.

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The purge valve has been changed, and the fuel trims are perfectly perfect.

It’s wonderful to hear, and thank you for the update!

Although I was on the verge of leaving out the purge valve entirely, I decided to do so because the P0496 detection approach is often effective at finding blocked valves.

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Hello, vb4me. I was wondering if you were based in Melbourne or somewhere else. Every few hundred kilometers or so, my 2011 Holden Cruze SRi-V suffers from the P0171 issue, which appears and disappears. Cheers Please log in or create an account in order to participate in the discussion.

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  • 23:51-23:5422880byvb4me on the 26th of August, 2018-26th of August, 2018-byvb4me on the 26th of August, 2018-byvb4me Salutations to everyone. Holden(Chev) Cruze 2011 with p0171 is under consideration. Lt 30 St 9 are the fuel trims at idling. When the revs are increased, these figures drop to a manageable level. So I turned on the smoke machine, assuming there was a vacuum leak. An air leak was discovered close to the throttle body. That was fixed, and the fuel trims were checked again to be sure the problem was resolved properly. After checking the numbers, it was decided to run the smoke machine one more round. Despite the fact that there was no smoke whatsoever, the gauge still indicated a significant leak. My cruise expertise is limited, so I’m not sure if it’s possible that the smoke is being routed to the incorrect port of entry on the cruise ship. It is the port that is connected to the turbo via a corrugated hose, which is, according to my understanding, the pcv. Cheers By vb4me on August 26, 2018, 23:54 p.m. In order to participate, you must first login or create an account. Tyler posted on August 27, 2018 at 11:3622889 Can I assume that because you stated the turbocharger, this is the 1.4L motor? Cruze, there are just two possibilities available on the US market
  • I’m not sure what options you’ll come across in other parts of the world. What is the TPS percentage while the engine is idle with no loads? One of my initial thoughts is that the PCV diaphragm in the valve cover, behind the silly small engine cover, has ruptured. When the engine is running, look for a small rectangular opening in the circular section of the valve cover. To make sure there is no vacuum leak, cover it with your finger. It’s also possible to keep an eye on the trimmings at the same time to see whether they need to be sharpened. In order to participate, you must first login or create an account. Vb4me’s 27th August 1504-15th August 151222890byvb4me’s 27th August 1504-27th August 151222890byvb4me’s Dear Tyler: Please accept my greetings. 1.4L turbocharged engine, I’m sorry for that. There is nothing wrong with the pcv diaphragm, which I examined. While at idle, the throttle position is 4.26 percent Rpm 698 MAF 1.75g/s MAP 44Kpa. 17 percent of the engine’s load In third gear at 3000 RPM, the throttle position is 25.3 percent, the MAF is 7 grams per second, and the MAP is 29.5 kilograms per square centimeter. Engine load is 19 percent, LTFT is 5.1 percent, and STFT is 3.5 percent. What I have seen is that the O2S1 voltage swings between 100mV and 660mV at the maximum and minimum levels. Due to the fact that the MAF signal is frequency based, the 4 Volt test at WOT was ineffective, but I did get a pleasing frequency rise at WOT. The maximum g/s at WOT was 100, which appears to be within the acceptable range. It was determined that there was no visible smoke when the brake booster port on the manifold was used. There was still enough of flow and no pressurization. An further observation is that there is no misfire while the engine is at rest. Thank you for your time. Edited by vb4me on August 27, 2018, 15:12. In order to participate, you must first login or create an account. Tyler posted this at 16:0022891 on August 27, 2018. When you were smoke testing, did you have anything blocking the air intake at the air filter box? Otherwise, it’s possible that you’re not generating any pressure at all. Alternatively, if your smoke machine did not arrive with the appropriate size plug, you may always use a plastic bag over the air filter box connection, like I do. Afterwards, replace the intake tube and tighten it. Bam! There is no waiting. You might also try removing the purge valve and re-checking the trims to see if there are any leaks left. They are notorious for flowing wrongly when directed open, and General Motors is infamous for running the purge when the engine is running idle. However, even if the command is low, if the purge valve is opening more than it should, it would be considered a vacuum leak. In order to participate, you must first login or create an account. Cheryl Hartkorndid on August 27, 2018 at 19:4922893 What do you mean, you reprogrammed the fuel trim? However, you should have anticipated the short-term trend to be negative as it was. Brake booster is not working properly. In order to participate, you must first login or create an account. The 27th of August, 2018, at 21:5822897byvb4me30 The plastic caps that came with the kit were utilized when I was performing smoke tests. Because the seal was not complete, the rubber glove was used to seal the intake. Despite my best efforts, the fuel trims have begun to build up again. Using the purge valve will be tried out next! It appears that everything is in working order with the brake booster. For the next few days, I won’t be able to view the vehicle. Thanks In order to participate, you must first login or create an account. 03:23:230:63byvb4me on September 4, 2018. Tyler You were the one who said it. Valve for purging. When the purge valve is disconnected, the trims begin to fall away to a more appropriate level for the environment. Not to the point of causing a dtc or causing damage to the vehicle, but close enough. There is no way I could have predicted that based on the data, but a little prodding in the correct direction, followed by a simple unplug it test, and Bob’s your aunty. Thank you, sir. In order to participate, you must first login or create an account. Tyler posted on September 4, 2018 at 13:33:23072. Tyler You were the one who said it. Valve for purging. When the purge valve is disconnected, the trims begin to fall away to a more appropriate level for the environment. Not to the point of causing a dtc or causing damage to the vehicle, but close enough. Nice! For some reason, General Motors cannot seem to get their purge valves to work properly. If you do decide to replace it, please let us know where you go for trimming. Looking at all of the data, there is no way I could have selected it myself, but a nudge in the correct direction and a simple unplug it test and Bob’s your aunty. Thank you, sir. That’s a new one on me, thanks! In order to participate, you must first login or create an account. on the 4th of September at 15:2123078byvb4me Tyler You were the one who said it. Valve for purging. When the purge valve is disconnected, the trims begin to fall away to a more appropriate level for the environment. Not to the point of causing a dtc or causing damage to the vehicle, but close enough. Nice! For some reason, General Motors cannot seem to get their purge valves to work properly. If you do decide to replace it, please let us know where you go for trimming. That is exactly what I will do if I see the automobile again! My primary focus is on diagnosing, although I do perform some minor fixes on occasion. Looking at all of the data, there is no way I could have selected it myself, but a nudge in the correct direction and a simple unplug it test and Bob’s your aunty. Thank you, sir. That’s a new one on me, thanks! I believe it’s a little bit of an Australian thing. Twisted version of an old Pommy proverb If you want to participate in the discussion, please log in or create an account. on the 18th of September, 2018 at 03:0923381 byvb4me You will receive an update. Replaced purge valve, and fuel trims are perfectly accurate. There were really some parts of the purge valve that were partially jammed open. In order to participate, you must first login or create an account. Tyler on September 18, 2018 at 08:00:23:38 You will receive an update. Replaced purge valve, and fuel trims are perfectly accurate. There were really some parts of the purge valve that were partially jammed open. Thank you for informing me of the latest developments! My understanding of why this did not result in a P0496 is still unclear to me. – Due to the fact that the P0496 detection approach is normally quite effective at identifying blocked valves, I was on the verge of leaving out the purge valve altogether. As a result, I have learned my lesson. Thank you from the following user(s):. vb4me In order to participate, you must first login or create an account. Daptal published an article on July 13, 2019 at 06:04:31:45. Thank you for your message, vb4me. Would you mind telling me if you are a resident of Melbourne? Every few hundred kilometers or so, my 2011 Holden Cruze SRi-V has the P0171 problem. Cheers In order to participate, you must first login or create an account.
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P0171 Diagnostic Trouble Code – What You Need to Know

Because the engine is running low on bank 1, the air to fuel ratio is heavily skewed in favor of the air.

What P0171 really means

The computer can make corrections over time as the engine ages, components fail or measurement sensors become defective. The computer may do this by increasing the amount of time the fuel injectors are turned on in order to richen the mixture. This code can also be used in conjunction with a P0174, which will indicate that bank 2 is lean. To achieve optimal combustion efficiency, the ideal stoichiometric ratio is 14.7 parts air to 1 part fuel. This provides for an excellent combination of fuel economy, performance, and fewer emissions during combustion.

What are the symptoms for a P0171 code?

It is common for lean codes to cause the engine to run badly, which the driver would notice as a high idle, a misfire, a loss of power, or even engine stalling. This can occur even before the check engine light illuminates. Furthermore, these symptoms will be more obvious at slower speeds and lower RPMs than at higher speeds and RPMs. The engine is better able to deal with lean conditions at higher speeds since the demand for air is larger.

What is the severity of a P0171 code?

Critical. A diagnostic check should be performed as soon as possible to determine the specific nature of the problem.

What repairs are required for a P0171 code?

There is a broad list of reasons why the engine runs lean, and a qualified technician will require time to figure out what is causing the issue. The problem, in contrast to rich difficulties, can occur on either side of the mixture – either too much air or not enough fuel. To be sure, there are some straightforward solutions – a broken vacuum line will allow air into the vehicle that the computer cannot account for, and a blocked fuel filter would reduce the amount of fuel that can be delivered.

What is the cost to resolve a P0171 code?

  • It is estimated that the diagnostic cost will be $100
  • That the part(s) and labor costs will be $50–$800 (depending on the diagnosis)
  • And that the overall cost will be $150–900.

This code will necessitate a diagnostic check, which will cost around $100 depending on how long it takes to identify the problem. In light of the fact that there is a laundry list of reasons why the engine runs thin, the average cost of each repair will vary significantly. Perhaps one of the easy fixes listed above will turn out to be a fortuitous break. A damaged vacuum hose sucking in air can cost as little as $50, while a blocked fuel filter might cost as much as $100. An oxygen sensor or a mass air flow sensor, on the other hand, can result in a cost of $400 to $500 dollars.

If your car is displaying this code, you should arrange a diagnostic check with a professional as soon as possible.

It’s not an issue. Openbay allows you to compare prices and arrange appointments with reputable technicians in your region without leaving your home or office. Written by an ASE Master Technician, this service article provides information on Obtain price quotes from neighboring businesses.

P0171 Code – Meaning, Causes, Symptoms (& How To Fix It)

When the Oxygen sensor on bank 1 detects a lean air-fuel combination that is too lean for the sensor to adjust, the P0171 code is shown in the engine management unit. This error code might be caused by a variety of different factors. Listed below is the information you need to know about the P0171 code.

Code Definition

P0171 – The system is running too lean (Bank 1)

What does the P0171 code mean?

The P0171 code indicates that the Oxygen (O2) sensor on bank 1 has detected a toolean mixture and has corrected the problem. The Oxygen O2 sensors have the capability of correcting a fuel mixture that is within a 15% tolerance. It will save the P0171 code if the air-fuel combination has to be corrected more than once in this manner.

P0171 Symptoms

If the fuel mixture is somewhat lean, you may not experience any further symptoms from the P0171 code other than the check engine light on your dashboard, which indicates that the code has been set. If you have an extremely lean fuel mixture, you may have any of the following symptoms:

  • It is possible that the engine will die while driving if the check engine light is illuminated, the engine is running rough or accelerating too quickly, the engine is losing power, and the engine is misfiring.

How serious is the P0171 Code?

A moderate lean mixture is one that has a substantial effect on the engine’s performance, but you will not notice any change in the engine’s performance the majority of the time. It’s possible that your car’s engine is operating at such a low state that your engine parts are in risk while under heavy load. It might be the first indicator of anything more serious that will break sooner rather than later, such as a blocked fuel filter or a faulty fuel pump. It is acceptable to drive a short distance to the workshop, but continuing to drive while the code is displayed may result in damage to critical engine components and components.

P0171 Causes

The P0171 indicates that there is a lean air-fuel mixture present, but it does not specify what may be causing the lean air-fuel combination to exist. Actually, there are other factors that might contribute to a lean combination. The P0171 error code can result in any of the following problems:

  • Air intake/vacuum/boost pipe leak (the most frequent)
  • Faulty PCV valve
  • Low fuel pressure (caused by a broken fuel pump, filter, or fuel pressure regulator)
  • Faulty PCV valve A defective EVAP purge valve
  • Faulty O2 sensors
  • Faulty EGR valve
  • Faulty MAP/MAF sensors
  • An exhaust leak (prior to the front O2 sensors)
  • A bad coolant temperature sensor
  • Faulty sensor wirings
  • A faulty ECM/PCM (rare)
  • And a problematic EVAP purge valve.

What repairs can fix the P0171 code?

Because there can be so many various reasons of the P0171 error code, there are many possible remedies available. The following are the most often seen solutions for the P0171 error code. The most frequently encountered from the top.

  • Replace any worn or damaged vacuum hoses or gaskets surrounding the intake manifold. Other intake leaks should be repaired. Replace the PCV valve, as well as the fuel pump, fuel filter, and fuel pressure regulator, if necessary, and fix wiring. In addition to replacing the EVAP valve, the O2 sensor(s), replacing the EGR valve, replacing the MAP/MAF sensor, repairing exhaust leaks, and replacing the coolant temperature sensor, Identify and repair damaged wiring
  • Replace the ECM/PCM (this is an uncommon occurrence)

Common Diagnosis mistakes

A typical diagnostic blunder is to begin replacing parts before completing a thorough diagnosis of the problem. A vacuum leak or a faulty PCV valve are the most common causes of the P0171 error code in the vast majority of situations. If you start changing MAF sensors, oxygen sensors, and other sensors, you will most likely wind up spending a lot of money without seeing any benefits. When the P0171 code appears, a malfunctioning oxygen sensor is not a very common reason, despite the fact that many people immediately replace the sensor when they see it.

How to diagnose the P0171 Code

When you have the correct tools, diagnosing the P0171 error code is straightforward.

It is frequently difficult to diagnose the P0171 without the use of these techniques. This tutorial is intended for professionals who have access to these software programs. If you ask nicely, you will most likely be able to borrow these tools from a workshop.

  1. Connect an OBD2 scanner to your vehicle’s diagnostics port. Make a second pass through the fault codes, looking for any other related trouble codes that might be causing the lean mixture. If you receive any other issue codes, proceed with the diagnosis method as described above. Assess live data from the MAF sensor and temperature sensors to see whether their readings are logical or significantly out of range
  2. Connect an EVAP smoke machine to the inlet of your vehicle and examine it for any intake leaks. Examine the PCV valve and the EVAP purge valve for any problems. A leak or a malfunctioning one-way valve will be discovered in the majority of situations as the source of the P0171 code. Check the gasoline pressure in the tank. Connect a fuel pressure gauge to the fuel rail and check to see that the fuel pressure is within acceptable limits. The fuel filter, fuel pump, fuel pressure, and regulator should all be checked if the fuel level is too low. Make that the EGR valve is working properly. An EGR valve that is jammed open might cause the air-fuel mixture to remain lean for an extended period of time. While you are opening and closing it with your diagnostic tool, attempt to inspect the valve inside it if at all possible. Make sure the MAF sensor is clean. The air-fuel mixture might be caused by a clogged MAF sensor. Examine it and look for any dirt or debris on the sensor. Following that, you should attempt to clear the issue codes and see if the code reappears. Alternatively, it might be damaged, so verify its values at idle and under pressure and replace it if necessary. Before installing the O2 sensor, inspect the exhaust pipe for leaks. If you discover any leaks, you should repair them immediately. If the problem persists and you have not discovered any problems with the items listed above, it is time to get your O2 sensor diagnosed. If you discover that it is providing incorrect values, replace it.

Estimated Repair Cost

The following are some samples of the repair expenses associated with the P0171 code. Parts and labor are included in the pricing listed. It does not cover the price of diagnostic testing.

  • Replacement of a vacuum hose costs between $10 and $50
  • Replacement of an oxygen sensor costs between $200 and $300
  • And replacement of a PCV valve costs between $20 and $60.

How to fix the P0171 code?

Replacement of the vacuum hose costs between $10 and $50; replacement of the oxygen sensor costs between $200 and $300; and replacement of the PCV valve costs between $20 and $60.

What causes P0171 code?

Replacement of a vacuum hose costs between $10 and $50; replacement of an oxygen sensor costs between $200 and $300; replacement of a PCV valve costs between $20 and $60.

What does P0171 mean?

The P0171 code indicates that the O2 sensor on bank 1 detected a lean mixture and reported it. In order for the sensor to function properly, the mixture must be within +-15 percent of the target range; if it is outside of this range, the p0171 code will be saved.

How to clear code P0171?

An OBD2 scanner is required in order to clear or reset the P0171 error code. It’s important to remember that simply resetting the code will not solve the problem that caused it in the first place, and it will almost certainly reappear. Do you require a maintenance manual? Investing in a decent repair manual will save you both time and money in the long run. Take a look at the most suitable alternatives here. Magnus is the proprietor of MechanicBase and the primary creator of the website. In his more than 10 years as a mechanic, the bulk of which have been spent specializing in sophisticated diagnostics and troubleshooting, he has gained valuable experience.

2014 Cruze LS 1.8L I4 NA P0171 vacuum leak

I’m currently working on a 2014 Cruze LS 1.8L NA I4 with roughly 120K on the odometer. MIL/CES light is activated because the automobile is idling in an irregular manner. There is only one code supplied by my reader: P0171 lean combination has been identified. I heard a whistling sound, which I took to be a vacuum leak, and I investigated more. I tested the purge control solenoid and found it to be properly sealed even though the power connector had been removed from the unit. I was eventually able to pinpoint the source of the leak.

This is located on the right side of the throttle body enclosure.

Parts replacement is not a problem for me; nevertheless, I would like not to waste money on replacement parts that do not need to be changed.

With the 1.8L, PCV Valve diaphragm failure is less prevalent than with the 1.4L turbo.

On September 19th, 2019, at 3:46 PM, BS Du Bois posted the following message: ‘BS Du Bois’

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