- P0102 is a very common trouble code with the Subaru Impreza. It means the the Mass Air Flow (MAF) circuit is low, and that it is not performing within its specified operating range. We will cover exactly what that means and potential fixes for it below.
What causes code P0102?
Diagnostic trouble code (DTC) P0102 isn’t in every vehicle’s code library, but whenever it appears it means “ Mass Air Flow (MAF) Circuit Low.” The code is set when the ECM/PCM perceives a problem with the mass airflow (MAF) sensor’s performance. The MAF sensor is mounted between the air filter and the throttle body.
Why is MAF sensor reading so low?
Low mass air flow readings do not mean the sensor is bad. A clogged up air filter or plugged catalytic converter can also cause lower air flow sensor readings. Vacuum leaks affect air flow sensor readings too. That’s why mechanics use a known-good sensor to compare the readings.
What is a normal MAF sensor reading?
It’s always a good idea to test a Mass Airflow (MAF) sensor before replacing it. With the engine at idle, the MAF’s PID value should read anywhere from 2 to 7 grams/second (g/s) at idle and rise to between 15 to 25 g/s at 2500 rpm, depending on engine size.
Can a dirty air filter cause P0102?
The primary reason for a P0102 code is restricted airflow. This situation is caused by a dirty or clogged air filter. Upon stepping on the gas, the engine needs to ingest a lot of air.
Can you drive with code P0102?
Code P0102 does not pose any serious danger to the driver or the vehicle and there are no drivability issues that may occur. However as the case with all Check Engine Light codes, it should be fixed as soon as possible to prevent any further damage to your vehicle.
How do I fix code P0137?
What repairs can fix the P0137 code?
- Replacing the O2 sensor for bank 1 sensor 2.
- Repairing or replacing the wiring or connection to the O2 sensor for bank 1 sensor 2.
- Repairing exhaust leaks before the sensor.
Can you drive without a mass air flow sensor?
Yes it can run just fine if it has an emissions system that does not use a mass air flow sensor. Otherwise it will not run well without it.
Why does my car run better with MAF unplugged?
The MAF sensor measures air weight in grams per second and air temperature and if either of those two are off then the ECU may command a leaner or a richer mixture. By disconnecting the sensor the ECU switches to limp mode and the car may idle better.
Does a bad MAF always throw a code?
Yeah a MAF doesnt always throw a code, +1 on unplugging it to see if it improves.
Can MAF sensor cause rough idle?
A rough idle can be caused by the mass airflow sensor. The most common fault is a dirty sensor. A malfunctioning MAF sensor will cause the computer to have a trouble code.
What voltage should MAF idle at?
5v-4.7v. It should never read less than. 5 at idle and never more than 4.7v at wide open throttle. if it is maxed on either end 0v or 5v there may be a problem.
What should map sensor read at idle?
With the engine not running and the key on, the MAP sensor should read around 28-inHg. When the engine is started and idling, the vacuum of the engine should reduce atmospheric barometric pressure by 20-inHg. The reading on the scan tool scan tool should be approximately 8- to 9-inHg.
Subaru Impreza P0102: MAF Sensor – Circuit Low
In the case of the Subaru Impreza, the problem code P0102 is fairly prevalent. It indicates that the Mass Air Flow (MAF) circuit is functioning at a low level and that it is not working within the parameters of its designated operating range. We’ll go into more detail about what this means and how it could be remedied further down. Due to the fact that the MAF sensor not reading properly can have a significant influence on the performance of the vehicle, it should be given top priority for repair.
It monitors the density and volume of air passing through the intake manifold between the air filter and the intake manifold.
When it does not receive the right reading, it might create serious problems with your Subaru Impreza’s performance.
P0102 Symptoms: Subaru Impreza
The fact that P0102 has to do with the Mass Airflow Sensor, which plays a significant role in the metering of the Impreza’s engine combustion process, ensures that it will manifest itself with recognizable symptoms. Usually, one or more of these symptoms may manifest themselves, although it is possible to have no symptoms at all other than the check engine light illuminate. Among the symptoms of P102 are:
- The service engine soon light is illuminated. An improper air/fuel combination results in a rough idle, stalling, and difficult starts.
Subaru Impreza P0102 Causes
The following are the most often encountered causes of P0102 in the Subaru Impreza. They are given in a rough chronological order, beginning with the most likely and ending with the least likely:
- When the MAF sensor becomes dirty, it will frequently get so clogged with dirt and grime that it will no longer be able to provide an accurate reading for the vehicle. However, cleaning them is not recommended due to the risk of damaging them if the material is handled incorrectly, and a wire brush should not be used. Here’s an excellent post from Family Handyman that explains precisely how to clean one. Cleaning of the MAF Sensor
- Failure of the MAF Sensor – While it is most likely that the MAF sensor itself is the source of the problem, it is vitally important to verify it before replacing it with another one. Here’s a video showing you how to test one without having to pull it. Though they are pricey, and because it only takes a few minutes to test one with a multimeter, this is essential for two reasons. The first is that they are difficult to find. The second is that they are difficult to test. If you do require one, you may find them at a fair price on Amazon. Just make sure to double-check that it suits your specific year Impreza before making a purchase. Intake Manifold/Vacuum Leak – If there is a leak in the intake manifold, it will be hard for the MAF sensor to acquire an accurate reading, resulting in the engine not starting. P0102 will be thrown if it is not possible to determine how much air is really entering the engine. MAF Sensor Wiring – Make sure to examine around the MAF sensor for any shorts or openings that may have occurred. Begin by visually checking the wire harness for signs of evident damage. If you are unable to locate any, you can examine the wiring using a multimeter. It is at this time that if you utilize the YouTube video above in the MAF sensor filthy portion and there is no voltage at all, you should try checking out the following: On nearly any vehicle, how to identify an electrical short. originating from BackYardMechanic
- The possibility of a blocked catalytic converter in your Impreza should be considered if you are experiencing P0102 in conjunction with a notable loss of power when driving at high speeds.
Ignoring the P0102 code on your Subaru Impreza is not a good choice, no matter what the cause is. Thanks for your help! If you have any suggestions or corrections, please post them in the comments section.
It is specified as P0102 Mass or Volume Air Flow Circuit Low Input in the Subaru P0102 problem code definitions. Specifically, this relates to the Mass Airflow Sensor (MAF), also known as the Air Flow Sensor (Subaru definition). This is a sensor that is both an airflow and an air temperature sensor in one. Take a look at the diagram below.
How Subaru MAF Flow sensor works
Electricity is supplied to the MAF through terminal 1 by the power relay. The sensor gets ground at the ECM B135 connector’s terminal number 30, which is connected to the ECM. From the ECM B135 connection, terminal 34, the MAF gets a reference voltage on terminal 2 that may be used to calibrate it. It provides information based on airflow. From the MAF terminal 3 to the ECM at the B135 connection, terminal 26, there is a 3-4.5-volt return path. This signal line is protected by a braided shield, and it connects to the ECM through the B135 connection, at terminal 35 of the connector.
Causes of Subaru P0102
Failure of the MAF On the MAF signal line, make a short to ground. Disconnect the MAF connector and the ECM B135 connector from their respective circuits. The resistance between B135, terminal 26, and chassis ground should be checked. In this case, the outcome should be less than 1. If this is not the case, look for a short to ground between the ECM and the MAF. You may get a no start or stall issue if any of the braided shielding wires come into contact with either terminal 3 at the MAF or terminal 26 at the ECM.
Disconnect the connection at the MAF and the B135 at the ECM.
In this case, the outcome should be less than 1. If this is the case, repair the gap between the ECM, terminal 26, and MAF 3 (if applicable). Ensure that the MAF and ECM B135 have proper terminal contact in 2017. Rick Muscoplat is a professional musician. Rick Muscoplat posted a blog entry on
SUBARU P0102 – OBD Codes
Circuit for Mass Air Flow (MAF) with Low Input The PCM monitors the MAF sensor circuit for low air flow (or voltage) input using the comprehensive component monitor to ensure that it is not malfunctioning (CCM). If the air flow (or voltage) changes below a minimum calibrated limit while the engine is running with the key on, the test is considered failed.
- • Disconnected MAF sensor
- • Opened MAF circuit to PCM
- • Opened VPWR circuit to MAF sensor
- • Opened PWR GND circuit to MAF sensor
- • Opened MAF RTN circuit to PCM
- • MAF circuit shorted to GND Air leak near the MAF sensor (intake air leak)
- An indicator that the throttle is closed
- MAF sensor has been damaged, as has the PCM.
A MAF V PID (MAF PID) value of less than 0.23 volts in continuous memory or when the key is turned on and the engine is running indicates a hard fault in the MAF V.
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Subaru P0102 Mass or Volume Air Flow Circuit Low Input – Car OBD Codes
Subaru P0102 OBD2 Code Definition: Subaru P0102 OBD2 Code Definition: A malfunctioning Mass Air Flow (MAF) sensor or circuit is the most likely explanation for this. A more technical definition would be that the MAF circuit had a voltage that was lower than what was intended (air flow).
Subaru P0102 OBD code symptoms that may be present The majority of the time, you will not have any substantial drivability issues, however you may experience symptoms such as a general decrease in power or sluggishness.
Subaru OBD code P0102: What Could Be Causing It? It is possible that the MAF has been unplugged, or that a wire connection has failed. It is possible that the MAF is unclean or somehow polluted (Note: if you use a reusable oiled air filter, be careful not to apply too much oil or that can contaminate the MAF). It is possible that the MAF sensor is malfunctioning. It’s possible that the vehicle’s computer is malfunctioning (very rare)
The most straightforward solution is to reset the code and see whether the problem persists. Then begin with the least expensive and most straightforward repair procedures: Check to see that the Mass Air Flow Sensor wiring is correctly connected and that there are no damaged or frayed wires in the system. Inspect the area around the MAF sensor for any air leaks. Remove the MAF and clean it with a spray cleaner, such as brake cleaning or electrical contact cleaner, before reinstalling it. Don’t be rough with the sensor.
The OBD2 Code Information Be Applicable For Subaru:
The 2013 Subaru WRX Concept, 2013 Subaru Viziv Concept, 2013 Subaru Outback, 2013 Subaru Legacy, 2013 Subaru Impreza, 2013 Subaru BRZ, 2012 Subaru XV, 2012 Subaru Impreza, 2011, Subaru XV Concept, 2011, Subaru Outback, 2011, Subaru Impreza, 2011, Subaru Forester, 2010 Subaru Legacy, 2010 Subaru Impreza, 2009 Subaru Impreza, 2008 Subaru Impreza, 2008 Subaru Forester, 2006 Subaru Impreza, 2005 Subaru R1, 2005 Subaru Pleo,
1. The list of vehicle manufacturers on the right-hand side of the display screen. The Subaru makes are represented by the ODB-ii codes that are currently in use. 2. Use the search box to look for any other OBD II Trouble Codes that may exist. In the search box, type in the five-character problem codes and hit the ‘Search’ button. Remember that a particularOBD-II code does not always represent the same thing across different vehicle manufacturers, since there are numerous different manufactures specific codes in use.
This is because not allOBD2 codes used by one manufacturer are also used by other manufacturers.
5. The material included on this website is provided solely for the purpose of providing general information. We will not be held liable for any acts you take while using your car. If you have any questions or concerns about the repairs on your car, please speak with your mechanic.
P0102 – Meaning, Causes, Symptoms, & Fixes
Circuit Low Voltage Input Mass or Circuit Airflow (MAF)Mass or Circuit Airflow (MAF)
What Does P0102 Mean?
Using the Mass Airflow (MAF) sensor, you can determine how much air is entering the engine. A low voltage output is detected by the ECM, PCM, or ECU, depending on the vehicle type (see your owner’s handbook for further information on your individual vehicle).
- The Check Engine Light is illuminated. Engine damage as a result of insufficient power
- Low fuel usage as a result of engine damage.
- MAF sensor that is faulty
- MAF circuit connectors that are corroded or damaged
- MAF sensor screens that have been coated with carbon
Code P0102 Severity – Low
Code P0102 does not represent a major threat to the driver or the vehicle, and it is unlikely that any drivability concerns will arise as a result of the code. However, as is the case with other Check Engine Light codes, it should be addressed as quickly as possible in order to avoid any more damage to your car.
Code P0102 Common Diagnosis Mistakes
Without performing a thorough examination of the MAF sensor electronics and sensor itself, the air filter should be replaced.
Difficulty in Diagnosing and Repairing the Problem – (1-4)
- After clearing the Check Engine Light with your FIXD sensor, put your vehicle on the open road to observe whether the Check Engine Light comes back on (20-50 miles should be a reasonable range)
- Examine your air filter and replace it if necessary
- Clean your MAF sensor to ensure that there are no foreign objects in the system that should not be there. Please see the following video for an illustrated and detailed walkthrough of the process. The simplest technique to determine whether or not your Mass Air Flow (MAF) sensor is the source of the problem is to unplug your electrical harness while your automobile is operating. Consult your owner’s handbook to see where the MAF sensor is located in your particular vehicle.
- NOTE: Before doing this test, make sure that all other components of your car have cooled down (6-8 hours of inactivity). Please refer to the following video for visual reference: If the engine of your automobile shuts down, this indicates that the MAF sensor is functioning properly. Otherwise, it indicates that your MAF sensor is not functioning properly and that it should be replaced.
- If following these methods does not remove the Check Engine Light, you may need to take your vehicle to a repair since there may be an electrical problem.
P0102 Mass or Volume Air Flow Circuit low Input
On July 11, 2021, an update was made. The mass air flow sensor, sometimes known as the MAF sensor, detects the amount of air that enters the engine. The mass air flow signal is used by the engine computer (PCM) to determine the amount of fuel to be injected into the engine. In situations where the signal from the mass air flow sensor is lower than predicted, the code P0102 is set. More information about mass air flow sensor may be found here. Causes and Symptoms P0102 is a code that indicates a variety of difficulties.
The following symptoms are associated with the code P0102: no start, stalling, loss of power, hesitancy, and harsh idle.
– a mass airflow sensor that is malfunctioning or polluted – obstruction of the air flow sensor element by debris -leaks of vacuum – air filter box is not properly closed; – incorrect air filter is fitted; – PCV system is leaking – intake air snorkel that is constricted or collapsed (boot) – an air filter that is clogged or limited – an air screen with a restriction before the air filter – aftermarket parts and accessories installed (e.g.
cold intake, modified air filter) – the incorrect air flow sensor was placed – an electrical fault with the wiring or connection for the MAF sensor.
– a PCM that is not working properly
A defective mass air flow sensor is the source of the code P0102 in several General Motors cars. It is necessary to clear the code and replace the MAF sensor if no other faults are discovered during the repair. The failure of the mass air flow sensor in some Mazda cars equipped with the Skyactiv engine may result in the code P0102 being displayed. Frequently, replacing the mass air flow sensor will remedy the problem. To resolve the problem with the trouble code P0102 in a 2002 Nissan Maxima, a technical service bulletin (TSB) advises cleaning out the air filter housing, replacing the airflow meter component, and resetting the engine control module (ECM).
The code P0102 is frequently associated with a malfunctioning mass airflow sensor in many European vehicles, including those manufactured by Volkswagen, Audi, Volvo, BMW, and Mercedes-Benz.
In this situation, the first step in diagnosing this issue is to reinstall the OEM components, clear the code, and then check to see whether the error code reappears.
If the air filter is really unclean to the point that it is restricting air flow, then the answer is yes. Check out this snapshot of an aftermarket filter that caused the code P0102 to appear because the filter screen has become fully blocked, thereby blocking air passage through the filter.
What needs to be checked:
Intake snorkel that has cracks in it (boot) Cracks, rips, loose clamps, and faulty connection in the snorkel that connects the mass air flow sensor to the engine intake must be looked for. Take a look at the snapshot. It is necessary to inspect the connector and wiring at the mass air flow for loose terminals, corrosion, or other problems before using it. The air filter should be examined and changed if it is unclean, torn, or does not fit correctly in the vehicle. Some automobiles (for example, Volkswagen and Audi) have a screen installed within the air duct before the air filter (Snow Screen).
- It is necessary to inspect the mass air flow sensor for pollution or obstruction, as shown in the photo.
- If the sensor element is clogged with dirt, cleaning it may be beneficial.
- Check for any relevant service bulletins.
- If you don’t have access to manufacturer service bulletins, search for ‘Make Model P0102 service bulletin’ on Google.
- As a result, at the sensor connection, the reference voltage and ground of the mass air flow sensor must be verified for accuracy.
- More information may be found at: The procedure for testing the mass air flow sensor.
- Catalytic converter that has become clogged.
- In the worst case scenario, the automobile may start and operate OK at idle, then bog down as soon as the engine is cranked higher than idle.
- Whenever a blocked catalytic converter is suspected, it is necessary to measure the exhaust back pressure.
- The code P0102 might potentially be caused by a low-quality component.
It is preferable to utilize a sensor from the manufacturer. The mass air flow sensor is priced between $70 to $350. It is simple to replace the sensor. If the problem is resolved, the code P0102 will disappear once the vehicle has been driven.
Need help with P0102 and p0113 codes
^that. It’s almost certain that there is a vacuum leak present. EDIT: After checking into the coding, it is clear that there is a problem with the ground here. It is necessary to check for continuity between the ground circuit on the MAF plug and the shield/ground joint connector located inside the automobile near the ECU in order to diagnose the problem. In addition to connecting to a simple chassis ground, the MAF wiring connects to a plug/terminal that should be located near the ECU wiring and which has numerous wires that come together and plug into a single joint connection.
- Take note of the way the Green Red (GR) wire is connected to the B83 connector on the left.
- It’s an 8-pin connector that’s located in close proximity to the ECU.
- In general, though, there aren’t many rectangular-shaped 8-pin connections available.
- What I didn’t verify was whether or not there was continuity between the different pins on that particular connection.
- It appears from the diagram that nothing on that B83 connects to chassis ground.
- And this appears to be standard practice in the car industry when it comes to sensors.
- As a result, I’d double-check for continuity with the ECU.
- A good connection should have a resistance of less than 1 ohm, once again.
- I believe you were experiencing some TGV Errors as well, correct?
Subaru Crosstrek Service Manual – Dtc p0102 mass or volume air flow sensor ‘a’ circuit low
ENGINE DIAGNOSTICS ENGINE DIAGNOSTICS (H4DO) Diagnostic Procedure with Diagnostic Trouble Code (DTC)DTC P0102 MASS OR VOLUME AIR FLOW SENSOR ‘A’ CIRCUIT LOWDTC P0102 MASS OR VOLUME AIR FLOW SENSOR ‘A’ CIRCUIT LOWDTC P0102 MASS OR VOLUME AIR FLOW SENSOR ‘A’ CIRCUIT LOWDTC P0102 MASS OR VOLUME AIR FLOW SENSOR TC is capable of identifying the following conditions: When a problem is identified, action is taken immediately.
Symptom of a problem: Improper idling is a problem. Failure of the engine to startPoor driving performance CAUTION: After servicing or replacing problematic parts, make use of the Clear Memory ModeClear Memory ModeOPERATION’ and the Inspection ModeInspection ModePROCEDURE’ to clear the memory and inspect the machine.
- CONFIRM THE CURRENT DATA.
- 2)Using the Subaru Select Monitor, determine the value of the «Air Flow Sensor Voltage».
- Subaru Select Monitor’ is an abbreviation for Subaru Select Monitor.
- Diagnostic Procedure with Diagnostic Trouble Code (DTC)DTC P0102 MASS OR VOLUME AIR FLOW SENSOR ‘A’ CIRCUIT LOW’ Diagnostic Procedure with Diagnostic Trouble Code (DTC) Continue to Step 2.
- Recreate the failure and then rerun the diagnostics to confirm the result.
- 1) Depress the ignition switch to the OFF position.
3)Put the key in the ignition and turn the key to the ON position.
3 (+) — Engine ground (): Is the voltage ten volts or higher?
NOTE:In this instance, the following item should be repaired: There is an open circuit in the harness between the main relay and the connectors for the mass air flow and intake air temperature sensors.
Check the wiring harness between the ECM and the mass air flow sensor as well as the INTAKE AIR TEMPERATURE SENSOR CONNECTOR.
2)Remove the connection from the ECM and set it aside.
Measure the resistance of the harness that connects the ECM connector to the connectors for the mass air flow and intake air temperature sensors.
22 and (B3) No.
Diagnostic Procedure with Diagnostic Trouble Code (DTC)DTC P0102 MASS OR VOLUME AIR FLOW SENSOR ‘A’ CIRCUIT LOW’ Diagnostic Procedure with Diagnostic Trouble Code (DTC) Move on to Step 4.Repair the open circuit in the harness that exists between the ECM connector and the mass air flow and intake air temperature sensors’ connectors.
- INSPECT THE HARNESS BETWEEN THE ECM AND THE MASS AIR FLOW CONNECTOR, AS WELL AS THE INTAKE AIR TEMPERATURE SENSOR.
- Connectorterminal (B137) No.
- Diagnostic Procedure with Diagnostic Trouble Code (DTC)DTC P0102 MASS OR VOLUME AIR FLOW SENSOR ‘A’ CIRCUIT LOW’ Diagnostic Procedure with Diagnostic Trouble Code (DTC) Continue to the next step.
- INSPECT FOR IMPAIRED CONTACT.
- Is there a problem with the ECM’s or the mass air flow and intake air temperature sensor connector’s connection?
- The mass air flow and intake air temperature sensors should be replaced.
Sensor for Mass Air Flow and Intake Air Temperature’ Mass Air Flow and Intake Air Temperature Sensor 1.SUMMARY OF THE DIAGNOSIS Identify if the air flow sensor has an open or a short circuit. If the item does not meet the specifications, it will be marked as NG. 2.DESCRIPTION OF THE COMPONENTS
|(1)||Air flow sensor||(3)||Voltage (V)||(4)||Intake air amount (kg (lb)/s)|
|(2)||Intake air temperature sensor|
3.CONDITIONS FOR EXECUTION
|Secondary Parameters||Execution condition|
4.GENERAL DRIVING CYCLE (G-DRIVE) Always carry out the diagnostic in a continual fashion. MODEL OF DIAGNOSTIC ANALYSIS If the period of time during which the following requirements are satisfied is more than the time given, the judge should be assigned the letter NG. Value of Judgment
|Malfunction Criteria||Threshold Value|
|Output voltage||≤ 0.127 V|
Time required for diagnosis: 500 milliseconds The Malfunction Indicator Light will illuminate as soon as a malfunction is identified.
In order to boost the speed (by accelerator pedal) a. Pushing down on the accelerator pedal will accelerate your car to the specified speed. Secondly, flip the switch to the ‘SET’ side once again (see step 1). Now that the desired speed has been established, the vehicle will continue to operate at that speed even if the accelerator pedal is not depressed. IMPORTANT: Models built to U.S. specifications If t is true. Diagnostic technique at its most basic level Procedure VDC stands for VEHICLE DYNAMICS CONTROL (DIAGNOSTICS) Diagnostic Procedures for the Most Basic Cases PROCEDUR ECAUTION: During the removal and installation of the VDCCM H/U connection, remove any foreign matter (dust, water, oil, etc.) from the connector.
- Attach the drive pinion retainer to the converter case with the help of the ST.
- 2016-2022 is a five-year period.
CEL P0102 and P0113
04-04-2004, 04:26 p.m. on April 4, 2004 Thread Starter is a registered user. Date of joining: March 2003 Location: United States Air Force 344 total posts Information on the vehicle: 2002 P0102 and P0113 are Subaru Impreza WRXCEL codes. Following the installation of my Helix uppipe, I received the CELs P0102 and P0113. I was wondering whether they were something I should be concerned about. Low MAF input is represented by the code P0102, while high intake air temperature is represented by the code P0113.
I was just looking for some feedback.
psycho 4:43 p.m.
Given that the intake temp sensor is built into the MAF, the combination of these codes indicates that it may have been detached.
on April 4, 2004 VIP MemberiTrader (V.I.P.
I tossed a PO420 code at it, and it spit out several additional false codes as a result of that.
on April 4, 2004, VIP MemberJoined in November 2002, based in New York City There are 1,646 posts in total.
Despite the fact that the codes stated above are not directly related to the uppipe, it is likely that they were caused by the MAF being unplugged or otherwise disrupted during the installation.
on April 6, 2004 Thread Starter is a registered user.
Well, I tossed P0546 as well, but that didn’t surprise me in the slightest.
Is it necessary for me to be concerned?
What is the price of a brand new one?
psycho The date is April 6, 2004, and the time is 08:40 a.m.
Car Information:02 WRX WRBI It’s much than probable that there is an electrical problem.
The wire should be examined very closely if they do and there is nothing obviously wrong with the sensor.
Retrace your actions from the uppipe installation to see if you can find out what may have gone wrong.
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406-16-2004 10:41 p.m.
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