Manifold catalytic converter versus post catalytic converter? (TOP 5 Tips)

By placing a catalytic converter right at the exhaust ports, the manifold catalytic converter can “light off” more quickly since the hot exhaust gas immediately heats up the catalytic converter core. If the carmaker includes a secondary post catalytic converter, the hotter exhaust gas helps that unit light off faster.

  • Manifold catalytic converter versus post catalytic converter Some carmakers use one or more manifold catalytic converters and a single post catalytic converter, while others use one or more manifold catalytic converters with a post catalytic converter for each bank. It all depends on the emissions standards the car was built for.

What is the difference between a manifold converter and a catalytic converter?

The exhaust manifold refers to the manifold of tubes that connect from each piston, and bring the exhaust together to the main exhaust pipe. The catalytic converter is mounted on the main exhaust pipe further down.

What is a manifold catalytic converter?

Bolted directly to the engine block, the exhaust manifold is the first section of a vehicle’s exhaust system. It funnels exhaust gases from all the cylinders and routes them to the car’s catalytic converter. Larger holes in a manifold will produce loud exhaust noise.

Which catalytic converters are worth the most?

According to data from 2020, the most expensive catalytic converter belonged to the Ferrari F430, with a mind-popping $3,770.00 price tag. Moreover, the F430 needed two of them, so a full replacement would run car owners $7,540 before labor costs.

Is the catalytic converter attached to the exhaust manifold?

The front catalytic converter is usually mounted directly to the exhaust manifold on a transverse mounted 4 cylinder engine.

Should I replace my exhaust manifold?

A faulty manifold must be taken off and inspected, and replaced with new manifold. Unfortunately, the exhaust manifold is an absolutely critical component to your vehicle, and if you ignore your cracked manifold, the problem will only get worse and more expensive.

What are the symptoms of a bad catalytic converter?

Among the symptoms of a bad catalytic converter are:

  • Sluggish engine performance.
  • Reduced acceleration.
  • Dark exhaust smoke.
  • The smell of sulfur or rotten eggs from the exhaust.
  • Excessive heat under the vehicle.

Is exhaust manifold and headers the same?

The difference between them is that an exhaust manifold is a solid cast iron structure across all cylinders while an exhaust header is made up of a series of individual steel tubes for each exhaust port, welded to meet at a collector to bring the exhaust gases down to a single pipe.

Why do people steal catalytic converters?

It’s part of a system that cleans out pollutants and prevents them from entering the atmosphere. And it’s also the reason why thieves across the U.S. are sawing off catalytic converters in order to get their hands on a few precious grams of the world’s most valuable metal.

Is catalytic converter worth replacing?

Is it worth replacing your catalytic converter? Due to the cost involved, replacing your catalytic converter should be considered a last resort. This is especially true if your car is very old, has a lot of miles on it, is not particularly reliable, and you live in a state with tough smog laws.

What car has most catalytic converters stolen?

The common consensus seems to be that the Prius, Tacoma, Lexus SUVs, and the Accord are some of the most targetted cars for catalytic converter theft. So if you own one of these, make sure your car is locked up safe and sound.

Why are Prius catalytic converters being stolen?

“The demand is high for catalytic converters, and they seem to know which ones command the highest prices, like those on the older Priuses.” Prices have soared for metals like platinum, rhodium, palladium and others, due to lower mining production in recent years, a trend that was exacerbated by the pandemic.

How much is a stolen catalytic converter worth?

It doesn’t take long for a thief with simple tools to snatch a catalytic converter, the NICB stated, and recyclers usually pay between $50-$250 for one. But the precious metals that come from hybrid vehicles can bring a thief up to $1,500 per catalytic converter.

What connects to the exhaust manifold?

A vehicle’s exhaust manifold plays the leading role in a car or truck’s exhaust system. It connects to each exhaust port on the engine’s cylinder head, and it funnels the hot exhaust to the exhaust pipe.

Can you drive a car without a catalytic converter?

What Happens When You Drive Without A Catalytic Converter? When facing the recovery costs of a stolen “cat,” many customers wonder, “Can I drive without my catalytic converter?” The answer is both yes and no. Technically, a car can function without a catalytic converter.

Is the catalytic converter before or after the muffler?

In a typical passenger car, the catalytic converter, which resembles a muffler in shape, is between the engine and the muffler. It’s on the underside of the car, usually underneath the passenger seat.

Manifold catalytic converter versus post catalytic converter

A manifold catalytic converter replaces a standard exhaust manifold, but it also integrates a tiny catalytic converter to treat the exhaust gases produced by the engine. Depending on the year, make, and model of the vehicle, as well as the engine layout, the vehicle may have a single manifold catalytic converter for a 4-cylinder engine or a manifold catalytic converter for each bank of a V-style engine, among other options. Hyundai Sante Fe Sport with 4-cylinder engine, 2015, exhaust system configuration Hyundai Sante Fe with a 3.3L V-6 engine, exhaust system configuration for 2015.

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Why use a manifold catalytic converter?

It is necessary for a catalytic converter to attain a minimum temperature of 600°F before it can begin to efficiently treat exhaust gases. Because the hot exhaust flow instantly warms up the catalytic converter core when a catalytic converter is installed directly at the exhaust ports, the manifold catalytic converter can ‘light off’ more quickly. On cold starts, where the engine is supplied a rich fuel mixture that has to be handled more aggressively in the catalytic converter, it is very crucial to have a rapid light-off.

If the automaker incorporates a secondary post catalytic converter, the hotter exhaust gas will aid in the lighting of the converter more quickly.

Why didn’t the old system work?

The difficulty with the earlier system, in which the catalytic converter is located under the car, is that the exhaust would cool down too much in cold weather, causing the underbelly converter to light off for a longer period of time. This resulted in greater emissions when the vehicle was started cold in cold weather.

Manifold catalytic converter versus post catalytic converter

A single post catalytic converter is used by certain automakers, whereas others employ one or more manifold catalytic converters with a post catalytic converter for each bank. Everything is dependent on the emissions criteria for which the vehicle was designed. (California or the federal government.)

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Do thieves steal manifold catalytic converters?

In most cases, no. They’re more accessible because they’re frequently visible from the outside under the hood. Cutting through the thick manifold, on the other hand, is significantly more difficult. Aside from that, the manifold catalytic converter contains less precious metal than the conventional catalytic converter, making it less valuable at the recycling facility. In other terms, it’s an excessive amount of effort for an insufficient return.

Protect the post catalytic converter against catalytic converter theft with a Cat Cage

You should secure the post catalytic converter with a customer-welded cage or with a commercially available Cat Cage, because it is the most vulnerable.

CatClamp surrounds the catalytic converter with hardened steel clamps and heavy-duty airplane cables to prevent it from being damaged. The year 2020 is a leap year. Rick Muscoplat is a professional musician. Rick Muscoplat posted a blog entry on

Is the catalytic converter part of the exhaust manifold?

Asked in the following category: General The most recent update was on May 21st, 2020. Catalytic converters are found immediately after the exhaust manifold and just before the resonator. Its job is to transform dangerous exhaust fumes into less poisonous gasses, which is what it does. Inside the converter, the catalyst is composed of platinum, rhodium, palladium, and in certain cases, gold. A connecting pipe links the engine exhaust manifold to the cylinder heads and directs exhaust gas via the tailpipe.

  1. One can also wonder, what exactly is a catalytic converter in an exhaust manifold.
  2. The term ‘exhaust manifold’ refers to the collection of tubes that link from each piston and connect the exhaust to the main exhaust pipe of the vehicle.
  3. Is the catalytic converter a component of the exhaust system, taking all of this into consideration?
  4. It is capable of converting hazardous molecules into innocuous ones indefinitely.
  5. Is it possible to determine the scrap value of a catalytic converter?
Metal/Material Current Price
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Small GM Cat Small sized cat from GM make vehicle. VIEW METAL DETAILS $77-$168/each
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Designed to safely transfer exhaust gasses away from the engine, lower engine noise, minimize tailpipe emissions, and ensure maximum fuel economy, the exhaust system also includes a catalytic converter. If these gases are not managed appropriately, they may be hazardous to both you and the environment. Ensure there are no holes in the front area of the exhaust system, since this might result in poor control of the discharge of pollutants. Maintain a tight seal around the exhaust system to prevent exhaust fumes from entering the passenger cabin, where they can cause major problems such as dizziness, fainting, and even death.

The manifold and pipes of the exhaust system are responsible for transporting the gases produced when fuel and air are burnt in the engine’s combustion chamber.

In response to the precise monitoring of the oxygen sensor signal, the engine management system reacts extremely quickly to changes in the amount of fuel delivered to the combustion chamber in order to maximize fuel efficiency while also generating an exhaust gas mixture that is optimized for cleanup by the catalytic converter (catalytic converter).

Upon exiting the catalytic converter, the transformed exhaust gasses travel past another Oxygen sensor, which provides feedback to the engine management system on how well the catalytic converter was able to clean up the dangerous exhaust pollutants.

Examine some of the exhaust and catalytic converter components, as well as their functions, including how the catalytic converter alters the chemistry of exhaust gas in more detail.

Exhaust Emissions Overview

Although exhaust emissions are composed of hazardous compounds, the molecules themselves are composed of atoms that are generally safe. We can use chemistry and catalyst technology to break apart molecules after they have exited the vehicle’s combustion chamber and turn them into harmless particles before they are released into the atmosphere. These reactions take place within a heated catalytic converter. A catalyst is essentially a substance that accelerates the rate at which a chemical reaction occurs without changing or being consumed in the process.

  1. The catalyst is composed of platinum or a metal that is similar to platinum in appearance, such as palladium or rhodium.
  2. Both varieties are comprised of a ceramic framework that has been coated with a metal catalyst, which is often platinum, rhodium, and/or palladium in composition.
  3. Three-way catalytic converters are standard equipment on automobiles with OBD II technology.
  4. This is the initial step of the catalytic converter, which is composed of a reduction catalyst.
  5. After coming into contact with the catalyst, a nitrogen atom is ripped out of a NO or NO2 molecule and held on to by the catalyst.
  6. The nitrogen atoms create a link with other nitrogen atoms that are also bound to the catalyst, resulting in the formation of nitrogen dioxide (N2).
  7. 2NO = N2 + O2 or 2NO2 = N2 + 2O2 are both valid equations.
  8. It does this by burning the unburned hydrocarbons and carbon monoxide over a platinum and palladium catalyst, which decreases their levels.
  9. As an example, 2CO + O2 = 2CO2
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Exhaust Manifold

In addition to connecting to the cylinder head, the exhaust manifold collects exhaust gas from each cylinder and pipes it into a single pipe. Traditionally, cast iron has been used to construct the manifold. Modern manifolds are made of stainless steel, steel, or aluminum, depending on the use. There is just one exhaust manifold for the vast majority of inline cylinder layouts. On engines with V cylinder layouts, such as V-6s and V-8s, there is typically one exhaust manifold per cylinder bank, which is a common configuration.

Some exhaust manifolds have the upstream or pre-catalytic converter oxygen sensor threaded into them in a central place, exposing the oxygen sensor tip to a combination of gasses from all cylinders, which can cause the sensor to malfunction.

If this concept is used on a V-6 or V-8 engine, an oxygen sensor will be installed in each manifold.

Catalytic Converter

This component, which resembles a muffler, is responsible for converting dangerous carbon monoxide and hydrocarbons into water vapor and carbon dioxide. Some converters also have the additional benefit of reducing hazardous nitrogen oxides. The converter is installed in the exhaust system between the manifold and the muffler. The catalytic converter is a large cylindrically formed metal container that is located in the exhaust stream near to the engine and is responsible for reducing emissions.

  1. In this case, the converter’s output is linked to the exhaust pipe system.
  2. When the catalytic converter starts working, the temperature is around 600 degrees Fahrenheit, with the average operating range being approximately 1,400 degrees Fahrenheit.
  3. If the temperature rises to roughly 2,000 degrees Fahrenheit or higher, the ceramic honeycomb begins to decay and weaken, and the catalyst metals begin to melt as a result.
  4. When the efficiency of the converter has dropped to the point that the vehicle may be over the pollution limit, the PCM will illuminate the Check Engine Lamp and set a diagnostic fault code in the car’s computer.
  5. Spark plugs that are fouled or misfiring are frequently the underlying cause of this problem.

Oxygen Sensor (upstream or Pre–Cat)

An oxygen sensor is used by all cars equipped with OBD II to determine how much oxygen is present in the exhaust stream. The sensor informs the engine management computer (PCM) whether the fuel mixture is rich (burning with less oxygen) or lean (burning with more oxygen) (more oxygen). The PCM continuously monitors the voltage of the sensor to determine whether the mixture is rich or lean, and it changes the quantity of fuel that is introduced into the engine to achieve the optimal mixture for optimum fuel economy and minimal exhaust emissions.

  1. The oxygen sensor must be sufficiently heated (600 degrees Fahrenheit) before it can reliably provide a voltage signal.
  2. However, during other operating conditions, such as cold start or idle, the hot exhaust gases do not supply sufficient heat.
  3. A rich fuel mixture is produced as a result, as is wasted fuel, and more emissions are produced.
  4. Heated oxygen sensors are equipped with an internal heater circuit that allows the sensor to reach working temperature more quickly than an unheated oxygen sensor.
  5. Whenever an oxygen sensor signal or heating circuit opens circuits, shorts, or goes out of range, the PCM often generates a diagnostic problem code (DTC) and illuminates the Check Engine light on the dashboard.
  6. It is possible that a sensor that has been deteriorated will still operate well enough not to trigger a DTC, but it will not perform well enough to avoid a rise in emissions and gas consumption.
  7. Various contaminants that enter the exhaust system, including lead, silicone, sulfur, oil ash, and some gasoline additives, can cause this type of damage to occur.

Heating three and four-wire oxygen sensors for mid-1980s to mid-1990s applications are normally suggested to be replaced every 60,000 miles, with the recommended replacement frequency for 1996 and subsequent OBDII-equipped cars being 100,000 miles.

Oxygen Sensor (Downstream or Post–Cat)

Several extra oxygen sensors are installed in or behind the catalytic converter in cars equipped with OBD II to monitor the effectiveness of the catalytic converter. If the engine has two exhausts with two independent converters, there will be one downstream or post-catalytic converter oxygen sensor for each converter, for a total of two downstream or post-catalytic converter oxygen sensors. The downstream oxygen sensor in the exhaust manifold performs the same tasks as the upstream oxygen sensor in the same manifold.

The PCM receives a high or low voltage signal, which indicates whether the fuel mixture is rich or lean.

A low level of activity from the downstream oxygen sensor indicates that the converter is doing its job and decreasing the contaminants in the exhaust stream.

When the efficiency of the converter appears to have dropped to the point that the vehicle may be over the pollution limit, the PCM will illuminate the Check Engine Lamp and issue a diagnostic fault code, indicating the problem.


The muffler’s purpose is to reduce the noise level of the exhaust to an acceptable level. Keep in mind that the combustion process is characterized by a succession of explosions that generate a great deal of noise. Mufflers that employ baffles to bounce the exhaust around dissipate the energy and reduce noise are the most common type. Mufflers that employ fiberglass packing to absorb sound energy as the gases pass through them are also available. A muffler is a deceptively basic pair of tubes with some holes in them that may be found within a car’s exhaust system.

They are intended to reflect the sound waves produced by the engine in such a manner that they partially cancel out the sound waves produced by the engine themselves.


The tailpipe is the last piece of exhaust pipe in the system, and it is responsible for venting exhaust gases into the atmosphere. On most vehicles, the tailpipe is connected to the exhaust system’s output side.

Should I Replace the Front or Rear Catalytic Converter

The front catalytic converter is responsible for the majority of the emissions reduction work. In the event that we had to guess (which you should never do when it comes to changing a catalytic converter), we’d think that the front catalytic converter is faulty. Only after all other emission systems have been thoroughly tested for appropriate functioning should you believe a faulty or poor catalytic converter is in operation. Because you only need to examine ‘one’ particular catalytic converter, it would be better to utilize the ‘intrusive’ CAT Test technique to detect which catalytic converter is broken, whether it is the front or rear.

  • The fuel management system must be precise, and the engine must not be experiencing compression or ignition problems.
  • There should be a minimum of a 40% reduction in emissions once the CAT is used in the testing procedure.
  • Infrared thermometers may be used to perform a Temperature Test, which is a simpler but less accurate test that can be performed at home.
  • You should see a temperature rise of at least 600 degrees Celsius at the output.

This test should only be carried out after your vehicle has been thoroughly warmed up and when the engine is running at a high idle (2500rpm). Due to the high temperatures of the exhaust components, extreme caution should be exercised.

What Is A Catalytic Converter And Why Do You Need One?

Cats may be considered a nuisance by some petrolheads, but they are an essential component of your vehicle’s pollution management system. For the better part of four decades, governments have waged a ferocious campaign against pollution, with the automobile industry bearing the brunt of the punishment. Every automobile made after that year was required to be equipped with an exhaust-reduction device known as a catalytic converter, which was enacted by the United States government in the 1970s.

What is a catalytic converter and what does it do?

In the exhaust system, the catalytic converter (cat) is located approximately a third of the way down the pipe and resembles a tiny metal chamber that accepts exhaust fumes and alters the chemical composition of them in order to limit the volume of harmful emissions fresh from the exhaust manifold. Located within the cat housing is a ceramic-based honeycomb structure that is lined with very valuable metals, each of which performs a specialized function in the lowering of emission levels. Nitrogen gas (N2), carbon dioxide (CO2), and water vapour are the three primary emissions generated by automobile engines (H2O).

  1. Carbon monoxide, hydrocarbons, and nitrogen oxides are the pollutants in question.
  2. 96 kilobytes An exhaust system from a vintage Chevrolet, showing the location of the catalytic converter in the system.
  3. The first is a reduction catalyst, which reduces NOx emissions by using platinum and rhodium within the honeycomb structure.
  4. After coming into contact with the catalyst metals, the nitrogen atoms are separated from the molecules, resulting in cleaner oxygen being released into the exhaust system to continue the journey through the exhaust system.
  5. These catalysts oxidize or burn the carbon monoxide and hydrocarbons that remain in the incoming gas, so reducing the amount of smog generated by evaporating, unburned fuel and reducing the amount of smog produced by combustion.
  6. The final level of emission control is provided by an oxygen sensor, which is located directly upstream from the catalytic converter.
  7. In theory, at this point, all of the fuel entering the combustion chamber will use up all of the oxygen available to carry out the combustion process to a successful conclusion.

Not only does this last stage improve the overall efficiency of the engine, but it also permits the engine to feed the cat with sufficient oxygen to efficiently finish the oxidisation process with the second catalyst.

So what is a sports cat?

A sports cat is capable of performing all of the functions of a conventional cat, but in a much more sleek and efficient package. Standard catalytic reactors are constructed in a honeycomb pattern to maximize the surface area of the catalysts while limiting their total volumes to a minimum due to the high cost of the precious metals used in their production. Unfortunately, the honeycomb might be viewed as a stumbling block for exhaust gases, which must be released into the atmosphere as rapidly and effectively as possible in order to be effective.

The honeycomb structure within a catalytic converter is also capable of collapsing due to overheating, resulting in an additional obstruction against which exhaust gases can pile up.

When designing an exhaust system, the primary goal is to move exhaust gases out from the engine in a smooth and rapid manner, with constraints and expansions such as a big catalytic converter only serving to create turbulence and, as a result, disrupted and slower airflow.

In order to reduce emissions, the ceramic matrix inside the honeycomb architecture is significantly finer than that found in a conventional catalytic converter, ensuring that the catalysts can successfully convert the necessary noxious substances to the levels required to comply with emission regulations.

Is a decat a viable option?

A catalytic converter has been fully removed and replaced with a straight ‘decat pipe’ in this instance. In the majority of circumstances, the straightforward response is no. The catalytic converter, in the opinion of many petrolheads, is the source of a serious clog in the exhaust system that must be removed. As a result, many petrolheads remove the catalytic converter from the system entirely, replacing it with a straight pipe. Despite the fact that this may increase the output of your powertrain and may even allow you to squeeze a few more horsepower from your engine, driving a car without a catalytic converter is considered unlawful in most countries.

  1. Cat stripping is also known as decatting in some circles.
  2. Video courtesy of the YouTube channel robsri18 The majority of folks who want to go the complete cat deletion way opt to take a chance and just keep a cat in reserve to put back in place when it’s time for their car’s annual inspection.
  3. And, given that the horsepower boost could possibly be counted on one hand depending on the size of the engine, a sports cat appears to be the far more practical alternative if you truly believe that the standard cat on your car is causing your powertrain to stutter.
  4. Catalytic converters operate best at high temperatures, which is why a precat is a smaller version of a catalytic converter that is located higher up in the exhaust system to assist in breaking down pollutants during engine start-up when the engine is running extremely rich.
  5. However, once again, this would be considered tampering with the emission controls of a normal exhaust system and would be regarded unlawful in the majority of nations.

Leave a comment below with your opinions on this frequent, yet potentially dangerous, tweak!

Is the catalytic converter part of the exhaust manifold? – Kitchen

It is the initial piece of a vehicle’s exhaust system, and it is attached directly to the engine block by a series of bolts. It collects exhaust gases from all of the engine’s cylinders and directs them to the car’s catalytic converter for processing.

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Does exhaust manifold include catalytic converter?

In most cases, replacing the catalytic converter does not need the replacement of the exhaust manifold. The term ‘exhaust manifold’ refers to the collection of tubes that link each piston and combine the exhaust before it exits the engine through the main exhaust pipe. The catalytic converter is installed on the main exhaust pipe, which is located farther down the exhaust system.

Is a catalytic converter and exhaust?

A catalytic converter is an exhaust emission control device that, through the catalysis of a redox process, turns harmful gases and pollutants in exhaust gas from an internal combustion engine into less-toxic pollutants.

Where is the catalytic converter located on a vehicle?

A catalytic converter is an exhaust emission control device that, by accelerating a redox process, turns harmful gases and pollutants in exhaust gas from an internal combustion engine into less-toxic pollutants.

Is the catalytic converter before or after the muffler?

As previously stated, the catalytic converter minimizes the quantity of hazardous pollutants released into the atmosphere by your vehicle’s exhaust. Most of the time, the converter is located between the exhaust manifold and the muffler, where it may benefit from the heat and metal present to assist in the conversion process.

Is the catalytic converter part of the fuel system?

The catalytic converter in your car is an extremely critical component of the vehicle’s emissions control system. The fuel economy of your car has abruptly decreased. When you press down on the gas pedal, your vehicle does not begin to accelerate.

Can I remove the catalytic converter from my car?

First and foremost, removing a cat from a car that was initially equipped with one is against the law. Following that, new automobiles are engineered to perform optimally when equipped with catalytic converters. It is possible that removing them will reduce your performance. You may also cause the ‘Check Engine’ light to illuminate as well as other fault codes to be displayed.

Why are they stealing catalytic converters?

Catalytic converters are stolen by thieves in order to get the valuable metals rhodium and platinum. Scrap metal recyclers may transform those precious metals into cash, and in many cases, they are doing it within the law and are unaware that they are being victimized by theft.

Can a car run without a catalytic converter?

As a general rule, driving without a catalytic converter is permissible in most situations. Driving without a catalytic converter will not do any damage to the engine or the vehicle in any kind. However, depending on your state, it may be unlawful to drive without a catalytic converter, and it is probable that your car may fail an emissions test as a result.

Does removing catalytic converter damage engine?

Removal of the converter has additional consequences, including the possibility of damage to the other components, particularly the oxygen sensor, which works in concert with the catalytic converter. This may also result in the check engine light being on, which will result in the vehicle failing an emissions inspection.

Which cars are most likely to have catalytic converter stolen?

The vehicles that are most susceptible to catalytic converter theft According to Which?, the Toyota Prius, Toyota Auris, and Honda Jazz are the most often targeted cars, with Admiral reporting a high number of instances of the Lexus RX being targeted as well as other luxury vehicles.

What connects to the exhaust manifold?

The exhaust manifold of a car or truck is the most important component of the vehicle’s exhaust system. Every exhaust port on the engine’s cylinder head is connected to this device, which directs the hot exhaust down to the exhaust pipe.

Can I replace my catalytic converter with a straight pipe?

Originally Answered: Can a straight pipe be used to replace a catalytic converter on a vehicle? Yes. It will, however, fail any further safety inspections. When it comes to exhaust emissions testing, you should be fine if your location does not need it.

How Much Does It Cost To Replace My Catalytic Converter?

Catalytic converters can fail as a result of age or prematurely as a result of a poorly performing engine. Also possible is that they will vanish completely if you park in a high-crime area. If you’ve found yourself in the market for a new ‘cat,’ there are a few things to consider before parting with your money.

How the catalytic converter works

Catalytic converters are emissions control devices that are needed for all street-legal automobiles manufactured during the previous 50 years or so. There is nothing complicated about their architecture, but they require sophisticated chemistry to clean up the waste gases that remain after the combustion process. To approach the catalytic converter, noxious exhaust gases must pass through a honeycomb design that performs chemical processes such as reduction and oxidation, effectively incinerating the gases before they exit the exhaust system.

Getty Images is the source of this image.

Why catalytic converters fail, and warning signs

Over time, catalytic converters will begin to fail owing to impact damage or severe fuel contamination of the interior catalyst surface, both of which are common causes. In recent designs (within the last 25 years), catalytic converters are included in the PCM calculations, thus ‘I’m sacrificing emissions for greater power,’ says the designer ‘In your new Camaro, this really translates to reduced performance. Symptoms of a failing cat include: higher gas consumption, poor engine performance, a check engine light, a failed emissions test, a sulfur smell (‘rotten eggs’), and a check engine light ‘), as well as the possibility of hearing the cat rattling while driving.

The most noticeable effect will be poor performance (picture driving over wet sand), which is caused by an increase in back pressure and an exhaust limitation.

This is the charred remnants of a honeycomb structure from a catalytic converter on an SUV that had an excessive amount of gasoline flowing through the exhaust due to a shorted injector and was unable to stop it.

Cost to replace catalytic converter

If you do a fast Google search to find out how much it will cost to replace a catalytic converter, you’re likely to be disappointed with the results you receive. Catalytic converter replacement costs can be as high as $2,000 or even $3,000 in certain current automobiles, according to some pricing comparison websites. Ouch. However, you should get a second opinion from a mechanic you know and trust. Savage Automotive owner and main technician Joseph Rakowski explains that ‘to go with respectable quality cats, the low end is roughly $400 and the top end may be a couple thousand dollars.’ Despite the fact that they are basic devices, the honeycomb catalyst is coated with platinum, palladium, and rhodium, making it a costly component in many cases.

For example, a direct-fit catalytic converter for a current car with dual exhaust with the catalytic converter integrated into the exhaust manifold can easily cost more than $1,000.

The process of replacing a catalytic converter on your own can take a few hours and requires some technical knowledge as well as specialized tools.

Make use of our directory to locate a skilled technician in your area. The cost of replacing catalytic converters can be quite variable. |Picture courtesy of

Why the price difference in catalytic converters?

If catalytic converters all perform the same function, why aren’t they all priced at around the same level? ‘There’s a good reason for the price difference,’ says the author ‘Rakowski expressed himself. Perhaps a dealership quoted someone $2,000, but the exhaust shop claimed they could install it for $300. As a result, the customer believes they have been taken advantage of and has overpaid by $1700.’ ‘It isn’t about someone trying to make an extra $1700 off of you,’ says the author. But what they don’t realize is that, if the interior of a catalytic converter were to be ripped open, the precious metals in the cheaper converter would cover just about 10 square feet, whereas the precious metals in the more costly converter would cover 60 square feet.’ According to what appears to be a motivational phrase, the large price disparity may be explained as follows: ‘It’s what’s on the inside that counts.” Although you cannot see inside, there are a few guidelines to follow in order to obtain a high-quality cat.

  1. Catalytic converters from reputed brands are what you’re looking for.
  2. You should avoid purchasing pollution control equipment from sketchy websites that sell $50 cats since it will be devoid of the needed metals and the guarantee will be voided by the federal government.
  3. It’s also because of modern, lower-emission designs that include the catalytic converter into the exhaust manifold, which reduces emissions.
  4. ‘If the customer installs a crap converter, the client may still have a check engine light on.’ ‘he explained.

How long does a catalytic converter last?

If there are no other issues with the car, the catalytic converter should survive for a very long period, which is encouraging news. Because it contains no moving components, it has the potential to endure for more than a decade if you follow up with planned engine maintenance. If you disregard the warning indications, however, they might be killed in a short period of time. Check engine light or misfires might indicate that your engine is discharging unburned gasoline into the exhaust system, which could be causing the converter to malfunction.

In addition to that, such items should persist for an extremely long period.’

Replace Catalytic Converter DIY vs Pro Shop

Do-it-yourself maintenance is always the most cost-effective option for a repair because you aren’t paying for the labor rate of a professional. According to AAA, the current average labor charge for an independent shop is roughly $80 per hour, while the rate for a dealership is somewhat more than $100 per hour. If the professional installation takes two hours, you’ll be out $200 in labor alone, not to mention the cost of the parts. If it takes you two hours to complete the task on your own, the labor rate is zero, and the cost is merely the cost of the materials.

  • It may be worthwhile to spend the extra money on the direct-fit option in order to save your mechanic a half hour of labor.
  • It’s similar to having a qualified chef prepare your meals or a talented tailor design your clothing; having someone who is knowledgeable about the activity may make a significant difference.
  • ‘A professional can identify additional issues that are occurring within the system,’ Rakowski explained.
  • A leaky exhaust system, faulty oxygen sensors, or anything else that has to do with introducing air or fuel into the system might all result in the code being generated.’ Rakowski has heard from a number of clients who claim they attempted to resolve the symptoms on their own.
  • In the event that a brand new high-quality catalyst is installed, it will suffer from the same problem and fail rapidly unless the true cause is identified and eliminated.
  • A catalytic converter replacement may have been necessary in the recent past.
  • Please share your thoughts in the comments section below.
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08-02-2015, 07:05 AM
I have a 20 year old suburban that I have kept in good shape.Recently, I had to have two manifold bolts replaced, the fuel filter and the fuel pump.Now I am getting a check engine light for my catalytic converter.It appears to be the only code showing.I don’t have the money to repair it. Should I get a second opinion?What will happen if I just ignore it?Thanks,Mike
08-02-2015, 07:24 AM
1. Get a second opinion.2. You may have other items causing this as long as its running correctly.3. A bad catalytic converter can clog up and create excess back pressure in your exhaust which can make your vehicle run badly and consume more gas.
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Manifold bolts? I presume we’re talking exhaust manifold?That’s probably your issue. ‘Cat system below efficiency’?you likely have a leaking exhaust manifold, which is triggering the cat below efficiency code.
Location: Florida1,643 posts, read2,687,090timesReputation: 1116
Most cars use a second O2 sensor behind the cat just to monitor the cat’s efficiency.A bad O2 sensor there will throw the code, and they are more likely to go bad than the cat itself.If it’s running fine and the exhaust smells normal a bad after-cat O2 sensor won’t cause ANY drivability problems, just the check engine light.If all seems fine other than the light go ahead and keep running it, won’t hurt a thing.
Location: Outskirts of Gray Court, and love it!4,480 posts, read3,935,496timesReputation: 4933
Its 20 years old, stuff is going to wear out! ITs at least a 95, so its not going to be a touchy about stuff as a newer engine. Whats the code?
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Quote:Originally Posted byHarborRatMost cars use a second O2 sensor behind the cat just to monitor the cat’s efficiency.A bad O2 sensor there will throw the code, and they are more likely to go bad than the cat itself.If it’s running fine and the exhaust smells normal a bad after-cat O2 sensor won’t cause ANY drivability problems, just the check engine light.If all seems fine other than the light go ahead and keep running it, won’t hurt a thing.That would actually throw. If I recall properly. O2 Bank 1 sensor 3 code. P0142-ishvs the ‘Cat Below Efficiency’ of P0420BUT. You caught something on post (I think) that I didn’t. OP says it’s a 20 year old vehicle, which would put it pre-OBD II.So. I’m confused here. I didn’t think OBD1 monitored the cat. If it’s truly a 1995, it should be OBD1, which has no cat codes.
Location: Florida1,643 posts, read2,687,090timesReputation: 1116
Quote:Originally Posted byLabonte18That would actually throw. If I recall properly. O2 Bank 1 sensor 3 code. P0142-ishvs the ‘Cat Below Efficiency’ of P0420.It would actually probably throw both eventually on OBD2 cars.It uses that O2 to know when to throw the P0420 so it will throw that first, and then if the output voltage of that O2 is out of whack too long (and only once drive cycle parameters are met) it will throw the P0142 (actually the P0144 is more likely).Quote:Originally Posted byLabonte18.BUT. You caught something on post (I think) that I didn’t. OP says it’s a 20 year old vehicle, which would put it pre-OBD II.So. I’m confused here. I didn’t think OBD1 monitored the cat. If it’s truly a 1995, it should be OBD1, which has no cat codes.Yes, 95 was the last year of OBD1 for most GMs, although a couple models did adopt OBD2 that year.Without knowing the code I guess we will never know.Not all OBD1 cars even had downstream O2 sensors to monitor the cat.
13,215 posts, read10,714,648timesReputation: 16903
Quote:Originally Posted byHarborRatIt would actually probably throw both eventually on OBD2 cars.It uses that O2 to know when to throw the P0420 so it will throw that first, and then if the output voltage of that O2 is out of whack too long (and only once drive cycle parameters are met) it will throw the P0142 (actually the P0144 is more likely).Yes, 95 was the last year of OBD1 for most GMs, although a couple models did adopt OBD2 that year.Without knowing the code I guess we will never know.Not all OBD1 cars even had downstream O2 sensors to monitor the cat.True. The 420 is such a generic code. I wish I knew the parameters for setting that on some vehicles. I’ve had that code set when there was an exhaust manifold leak (Actually, there was a hairline crack on the exhaust manifold at the first ‘manifold’ cat on a vehicle with multiple cats) and when the catalyst has come loose in the housing and many other times. It rarely actually points to a problem with the cat itself.
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All times are GMT -6. The time now is12:55 PM. MagnaFlow Manifold Catalytic Converter HM Grade Federal/EPA Compliant 50805 : Automotive

4.0 stars out of 5 for this product Amazon and auto parts are suspect, but Magnaflow is a reputable company. Update: It was deployed this week, thanks to the efforts of nn on November 19, 2011. Following are some observations. Generally speaking, I’m really delighted with it. Although the product’s performance has been excellent, Amazon’s shipping service has been subpar. 1. The device is actually smaller than the factory-installed Nissan catalytic converter, as advertised. As a result, the heat shield is unable to be welded on at all.

  • Theoretically, excessive heat might cause them to wear out more quickly.
  • 2.
  • Following the installation, the engine produced a pleasant, mild vroom sound.
  • Not only was I thrilled with the fact that my engine was shielded from Nissan’s terrible cat, but I was also pleased with the fact that the old vehicle had gained in performance.
  • If you look closely at my photo, you’ll notice an indentation on the intake manifold on the left side.
  • I was apprehensive that there was a flaw in it.
  • 4.

Overall, I’m extremely satisfied with the outcome.



I’m not sure if it’s a problem with the packing or if it just does not sell with them.

The header gasket and two tension springs are not included in the package, regardless of where you purchase it.

Nissan makes a kit specifically for this purpose.

Unlike OEM, you are unable to connect the exhaust manifold covers (see Figure 4).

My technician will just cut the bracket off the original cat and weld it on to this one, which should take no time at all.

I believe the most significant advantage is that it is manufactured in the United States.

The fact that there is no live customer care and that this isn’t really a self-explanatory component makes me wary of purchasing it from Amazon.

It is hoped that it will be down for Black Friday weekend.

If the manufacturer can send the necessary components to me in time, I should be able to put it together in the next several weeks. Otherwise, I’ll send it back and order another one, which will hopefully have all of the necessary components.

Exhaust Manifold Catalytic Converter with Gaskets

584 units were sold in total. $219.44 is the list price. Our Price:$120.57 (plus tax) Details may be found here.

Restricted States: California, Colorado, New York, Maine
Exhaust Gasket and Hardware Included: Yes
Exhaust Material: Stainless Steel
Exhaust Mounting Hardware Included: No
Exhaust Oxygen Sensor Location: Post-Catalyst
Exhaust Connection Type: 2 Bolt
Exhaust Engine Size: 1.7L
Oxygen Sensor Ports: 2

Take a look at Fitment.

Catalytic Converters is the distributor of this product. Catalytic Converters are available for purchase online.

  • Designed to keep the wood from warping or splitting
  • The materials used are of the highest grade
  • Heat resistance has been evaluated at high settings. Quality inspection results meet or exceed expectations for replacement
  • Approved in 47 states (please see cautionary statement below)
  • brings you yet another high-quality product at exceptional value.
  • Due to stricter emissions regulations in California, New York, and Maine, this item is not approved for sale in those states. Purchase of this item is not recommended if your car is registered in California, New York, or Maine. This item complies with federal emission regulations and is not meant to be used in place of parts constructed to California regulations. Any alterations of any type to this item will void any and all warranty coverage for it. If the catalytic converter substrate is melted or fractured, the warranty is invalid
  • This is due to a problem with the automobile itself, not the catalytic converter. Because of its size and form, it is possible that it will develop visual faults throughout the stocking and shipping processes. The powder coating finish is intended to extend the shelf life of the product by eliminating surface scratches that may occur over time as a result of the high temperatures attained when the product is in use. Products that have been damaged as a consequence of abuse, misuse, incorrect repair, improper installation, alteration, or modification are not covered by the guarantee. The O2 sensors must be changed at the same time as the converter, or else the warranty will be invalid. In our research, we discovered that a failure of either the front oxygen sensor (also known as an Air-Fuel Ratio Sensor) or the read downstream sensor might result in a bogus P0420 code being generated. When you replace the converter, you should also replace both of the sensors.

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