Catalytic Converters

A catalytic converter is an antipollution device that reduces the toxicity of emissions on an automotive exhaust system. The converter uses platinum-iridium catalyst to convert toxic pollutants, carbon monoxide, and hydrocarbons into less harmful substances.

2,415 Questions
Car Sounds
Catalytic Converters
CV Joints
Shocks and Struts

If you hear rattling sounds under your car while it is running is it the catalytic converter and if so how much will this cost to repair?

It is probably the heat shield that is between the converter and the bottom of the car. It does what the name. They can be a pain to fix properly. I have always tried fixing mine but the "rattling" noise would always return sooner or later. I ended up taking mine off. Plus these heat shields get old and tend to vibrate relentlessly. Best best is to have someone you know take a look and see what they can do.

Yes it is, and it can cost anywere from $80.00 to $200.00 to fix.

It is also possible that the ceramic compount "honeycomb" in the catalytic converter is breaking apart and/or broke loose inside the converter. If this is the case, you *might* fail emissions but it shouldn't hurt anything (other than failing emissions).

http://www.autozone.com/servlet/UiBroker?UseCase=S001&UserAction=viewSimpleDiagInfo&Parameters=info

just buy a clamp for your heatsheild.. its the cheapest and easiest fix.

I fixed my heatshield with a screw gun and some self tapping screws . The shield is spotwelded in place. Find the areas that have came loose and screw, I used 3/8 inch panheads that where galvinized, they hold up to the heat very well and I hav'nt had anymore problems. I did this 2yrs ago and have had no problems.

353354355
Catalytic Converters
Check Engine Light

Can a catalytic converter problem cause your car to stop running?

Yes if it is totally clogged.

289290291
Catalytic Converters
Oxygen Sensors
Mercury Sable
Ford Explorer XLT

Where are oxygen sensors located and what are the names - designations - Sable?

Here is the low-down on oxygen sensors, and their location designations explained:

Oxygen sensors are screwed into the exhaust system at various points. Some people say that there are 4 oxygen sensors, but technically, that is not correct. Only the front 2 are considered oxygen sensors.

These oxygen sensors are screwed into the exhaust pipe or directly into the exhaust manifold, one on each bank. Because they are in front of the catalytic converter, this is often referred to as 'upstream'.

The other 2 are actually called catalyst monitors. They are oxygen sensors, but they serve a different purpose. They monitor the activities of the catalytic converters, thus the name, catalyst monitors. They are screwed into the exhaust one on each bank, after, or downstream, of the catalytic converters.

On a 4 cyl engine, there are only a total of two such sensors, the one in front of the catalytic converter is the O2 sensor, the one behind the cat is the catalyst monitor.

The location names for them are as follows:

  • On a 4 cyl, the front / upstream is called "bank 1 sensor 1" and the rear / downstream sensor is called "bank 1, sensor 2."
  • On a V6 or V8 engine:
    • the passenger side bank on a forward facing engine, or the bank closest to the firewall on a transverse mounted engine, is bank number 1, so the forward / upstream sensor on that bank would be "bank 1, sensor 1."
    • The driver's side bank (forward facing mount engine), or front bank (transverse engine) would be bank number 2, thus the forward / upstream sensor on that bank would be "bank 2, sensor 1," and the rearmost / downstream sensor on that bank would be "bank 2, sensor 2."

NOTES:

  • Use lots of penetrating oil - allow to soak - to make removal easier and avoid damaging the exhaust pipe
  • the sensors are screwed directly into the pipe at a 90 degree angle and look like spark plugs with either 8", 12", or 14" wires attached to them
  • Tools:
  • ** ** it is usually a 7/8ths size wrench
    • special-purpose oxygen sensor socket - not expensive, and commonly offered for free use by the auto parts store
  • Inspect the condition of wires and that they are not touching any parts of the exhaust system

NOTES:

Rule of thumb: Bank 1 is on the side of the engine with cylinder #1

6 Cylinder numbering:

-----

1 2 3

4 5 6

----

Front of vehicle

AnswerBank 1 is usually the engine side with the number one cylinder. As you have a 6 cylinder and front wheel drive, bank one is on the backside of the motor - meaning near the firewall/windshield. Sensor 1 is the sensor before the catalytic converter. Open the hood, follow the exhaust pipe from the motor towards the catalytic converter. The first sensor you come to is sensor one. Sensor 2 is after the catalytic converter. Bank 2 is the opposite side of the motor from bank 1 (obviously). CorrectionAlso see http://v8sho.com/SHO/TSB0197HO2SServiceTips.htm#fig1 Answer - EditorialAnd before spending any $$ on replacing a sensor, I would test it to ensure it really really has failed! It's very likely someone read the DTC (diagnostic trouble codes) that cited an oxygen sensor reading - but then said something that leads you to believe it's a failed/bad sensor and needs replacing. The vast majority of times that is NOT the problem.

Take those codes and research them on the internet! (see "Related Links")

A perfect example are P0171 and P0174 codes - indicate a lean mixture was read in bank 1 & 2 (respectively). On the Windstar, that's a prime symptom covered in Technical Service Bulletin TSB# 03-16-1 (see "Related Questions")

The auto parts store guy had me ready to spend $80 on 2 sensors. - CCoach

AnswerThey are screwed into the exaust system at various points. Some people say that there are 4 oxygen sensors, but technically,that is not correct. Only the front 2 are considered oxygen sensors. They are screwed into the exaust pipe, one on each bank,after the exaust manifold, but before the catalytic converter. Sometimes they are screwed directly into the exaust manfold itself.

The other 2 are actually called catalyst moniters. They are oxygen sensors, but they serve a different purpose. They moniter the activities of the catalytic converters, thus the name, catalyst moniters. They are screwed into the exaustone on each bank,after, or downstream, of the catalytic converters.They are all just typical 4 wire heated O2 sensors, nothing special about them. The EPA requires all cars sold in the US after 1996 have heated oxygen sensors.

AnswerAs far as I know the only place OXYGEN sensors are mounted are on the exaust system, either on the header pipe or after the cat-converter. Rarely are they located on the cat-converters themselves. Mostly they will have one electric wire connecting them to the computer but depending on the year and make the will have a two wire connection. I am not certain about the Sable's electrical wiring but the OXYGEN SENSERS postions for FORD/MERCURY are generally on the hot pipes. I hope this helps. Answercheck behind the pass side catalitic converter. (after) the unit. AnswerBank 1 is the front side of the motor (front of car), Bank 2 is the back side of car. (Bank one is actually associated with the number 1 cylinder which just so happens to be on the front of the car for the sable). Sensor 1 is before the catalytic converter, Sensor 2 is after the catalytic converter. Example, Bank 1, sensor 1. The sensor in the exhaust pipe for the front side of the motor before the catalytic converter. AnswerThe o2 sensor is in the exhaust manifold. It looks like a plug sticking out of the manifold and has 2 and sometimes 4 wires coming out of it. Hope this helps Don's Auto AnswerThey are screwed into the exaust system at various points. Some people say that there are 4 oxygen sensors, but technically,that is not correct. Only the front 2 are considered oxygen sensors. They are screwed into the exaust pipe, one on each bank,after the exaust manifold, but before the catalytic converter. Sometimes they are screwed directly into the exaust manfold itself. The other 2 are actually called catalyst moniters. They are oxygen sensors, but they serve a different purpose. They moniter the activities of the catalytic converters, thus the name, catalyst moniters. They are screwed into the exaustone on each bank,after, or downstream, of the catalytic converters. Answerthe oxygen sensors are on the exhaust pipes right before where it hooks into your manifolds. there are 2 of them. one for each manifold. AnswerGenrally the O2 sensor in most vehicles is located in the exhaust system. With the engine cool enough to touch, look at the front of your engine where the exhaust manifold is attached to the engine. The O2 sensor will be attached to the manifold or a little lower where the manifold joins into a single pipe. It will be the only electrical component attached to your exhaust system nearer to the engine. Never remove any nut, bolt, spark plug or sensor from a hot engine. Warping of the orifice may occur as it cools and now you have a bigger problem. If you must, then replace the part immediately.
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Auto Parts and Repairs
Catalytic Converters

The function of a catalytic converter is to?

Convert unburnt fuel, carbon monoxide, and nitrogen oxides into nitrogen, water, and carbon dioxide.

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Catalytic Converters
Dodge Grand Caravan
Ford Crown Victoria
How To

How to fix shudder from torque converter in 1993 Crown Victoria?

Ford says to flush the transmission through completely with Mercon V fluid. In other words, replace every drop of Mercon III fluid tha it came with, for Mercon V. You cannot get away with just dropping the pan and doing a service. That only removes about 6 quarts of fluid. That transmission holds about 15 quarts, so you have to use a flush machine to run it through. After you exchange all the fuid out for Mercon V, then it will take about 500 miles for the shudder to improve. And then Ford charges you $350 for a fluid change that doesn't help and just might destroy the tranny in a car that age. Ford has a bulletin on this, your torque converter is going out and it will only get worse. Just add some GM 'Limited Slip Additive' to your tranny, will work wonders. There are some transmission specific additives out there too, just haven't tried them myself. -motoman22

177178179
American Cars
Catalytic Converters
Oxygen Sensors

Where are oxygen sensors located and what are the names - designations - Taurus?

Here is the low-down on oxygen sensors, and their location designations explained:

Oxygen sensors are screwed into the exhaust system at various points. Some people say that there are 4 oxygen sensors, but technically, that is not correct. Only the front 2 are considered oxygen sensors.

These oxygen sensors are screwed into the exhaust pipe or directly into the exhaust manifold, one on each bank. Because they are in front of the catalytic converter, this is often referred to as 'upstream'.

The other 2 are actually called catalyst monitors. They are oxygen sensors, but they serve a different purpose. They monitor the activities of the catalytic converters, thus the name, catalyst monitors. They are screwed into the exhaust one on each bank, after, or downstream, of the catalytic converters.

On a 4 cyl engine, there are only a total of two such sensors, the one in front of the catalytic converter is the O2 sensor, the one behind the cat is the catalyst monitor.

The location names for them are as follows:

  • On a 4 cyl, the front / upstream is called "bank 1 sensor 1" and the rear / downstream sensor is called "bank 1, sensor 2."
  • On a V6 or V8 engine:
    • the passenger side bank on a forward facing engine, or the bank closest to the firewall on a transverse mounted engine, is bank number 1, so the forward / upstream sensor on that bank would be "bank 1, sensor 1."
    • The driver's side bank (forward facing mount engine), or front bank (transverse engine) would be bank number 2, thus the forward / upstream sensor on that bank would be "bank 2, sensor 1," and the rearmost / downstream sensor on that bank would be "bank 2, sensor 2."

NOTES:

  • Use lots of penetrating oil - allow to soak - to make removal easier and avoid damaging the exhaust pipe
  • the sensors are screwed directly into the pipe at a 90 degree angle and look like spark plugs with either 8", 12", or 14" wires attached to them
  • Tools:
  • ** ** it is usually a 7/8ths size wrench
    • special-purpose oxygen sensor socket - not expensive, and commonly offered for free use by the auto parts store
  • Inspect the condition of wires and that they are not touching any parts of the exhaust system
  • No special tool is required if you are not reusing the old sensor. Simply unplug sensor harness from vehicle harness then snip off the wires at the sensor. This will allow you to slip a 7/8" box wrench over the sensor for a tight, no slip grip for removal. Use the 7/8" open end wrench for installation of the new one.

NOTES:

Rule of thumb: Bank 1 is on the side of the engine with cylinder #1

6 Cylinder numbering:

-----

1 2 3

4 5 6

----

Front of vehicle

Answer - EditorialAnd before spending any $$ on replacing a sensor, I would test it to ensure it really really has failed! It's very likely someone read the DTC (diagnostic trouble codes) that cited an oxygen sensor reading - but then said something that leads you to believe it's a failed/bad sensor and needs replacing. The vast majority of times that is NOT the problem.

Take those codes and research them on the internet! (see "Related Links")

A perfect example are P0171 and P0174 codes - indicate a lean mixture was read in bank 1 & 2 (respectively). On the Windstar, that's a prime symptom covered in Technical Service Bulletin TSB# 03-16-1 (see "Related Questions")

The auto parts store guy had me ready to spend $80 on 2 sensors. - CCoach

There are 4 O2 sensors on your Taurus. 1 is under each exhaust manifold and there are 2 just before the Y pipe. If it shows no. 2 on the scanner it is on the front side near the radiator. If it shows no. 1 it is near the fire wall - the side of the engine with cylinder #1. 3 and 4 are located just before Y pipe but I don't know which one is which. its located on the right hand side of the engine when you are facing forward with the hood up its located in the lower right hand corner Under hood, center, lower engine area, front side of engine, mounted in exhaust pipe .

Oxygen sensors are always screwed into the exhaust manifold as they sense the amount of oxygen in the exhaust and tell the computer how to mix the air fuel ratio. More or less.

just in front of the cat converter.. on each pipe... There are four (4)oxygen sensors on the 96 Taurus the two in the back are screwed into the tailpipe on both sides of the Catalytic converter. They are on the top of the pipe so hard to see, but you'll see the wires coming off them. The other two are at the front of the engine. the sensors are located on the upstream and down stream of the exhaust system..one under the car behind the catalytic converter and one just in front at the top of the exhaust system comming out of the engine block.where is #1 sensor located ?

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Car Smells
Catalytic Converters
Chevy Malibu

Why might your 2004 Chevy Malibu smell like exhaust inside the car?

the inside of your car will smell like exhaust if you have C.F (cabin filter) in you car and it has not been changed recently This may sound dumb, but some people may miss it. If you have a car in front of you that smells bad, or are in a smelly environment, and you don't have the recycle air button on, "fresh air" will enter the car.

169170171
Catalytic Converters

Can you remove the catalytic converter on a toyota tercel?

Yes, as long as you install a new one. It is illegal to remove the converter from any vehicle.

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Catalytic Converters
Oxygen Sensors

How do you get into Buying and Selling Scrap Catalytic converters?

Check this site out! They have a book that tells your how to buy Scrap Catalytic Converter! The book even has a list of buyer in all 50 states and over 350 pictures with detailed descriptions and a lot more. Click the link.

135136137
Catalytic Converters

Can a broken catalytic converter cause high oil consumption?

No

135136137
Car Sounds
Catalytic Converters

Can catalytic converter cause a knocking sound?

Yes

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Catalytic Converters
Car Stalling Problems
1982-1994 Chevy Cavaliers

If your car sputters and even stops running in the morning sometimes especially if it has been wet outside what could be the cause of this?

This was exactly what was happenning to my 1989 Ford Bronco 351W engine. After it warmed up, it worked OK. It turned out to be a stuck/rusty EGR valve. I had replaced a few inexpensive parts until I realized what it was. I simply removed it from the block and sprayed the inside with wd40 and attempted to carefully work it back and forth. This fixed it up and its been working fine for a year now. In an extreme case, you might have to get a new one.

You can buy a spray from any local department store that has an autmotive section. The spray is for wet spark plugs and when you dowse them and your distributor cap it clears the water off.

If you try this and the car fires up on those wet days and eminates your problem then you know it results from damp spark plugs and distributor.

If you have never replaced a new set with wires and cap - do it and reap the rewards.

Likely a spark problem. Might be a cracked distributor cap, or faulty wires. Moisture makes insulators more conductive, and reduces the spark that can be generated, therefore no spark in the cylinder

129130131
Catalytic Converters
Chevy Astro
Ford Ranger XL

Can a plugged catalytic converter cause engine to backfire through intake and exhaust pipes are red hot in minutes?

Yes, and it will cause loss of power.

Better replace the defective parts immediately before you burn your valves and ruin the engine.

128129130
Catalytic Converters
Environmental Issues
Air Pollution

What does 'Carbon offset' mean?

Carbon is an element, so it is not created or destroyed. No carbon enters or leaves earth. Therefore, the amount of carbon on earth never changes. It exists in several forms: * carbon dioxide, a greenhouse gas * inside living things - people, animals, trees, plankton, etc. * buried underground (in land or sea) in the form of fossil fuels (coal, oil and natural gas) When we burn fossil fuels, the carbon in them is turned to carbon dioxide and released into the air, where it causes global warming. However, life is largely made of carbon; anything alive has got carbon from somewhere. Plants take carbon dioxide from the air and turn it into the organic chemicals they need to survive and grow (we say they "fix carbon"). In this way carbon is moved from the air to a "carbon sink", which is a good thing. Suppose I cause one kilogram of carbon to be released into the air (say, by driving to work every day). Now suppose I plant a tree which will eventually grow so big that it contains one kilogram of carbon. Then the tree would have absorbed the carbon from the air, and my overall contribution to global warming would be zero.

But instead of planting trees in my own back garden, I can pay a company to plant trees. These companies allegedly plant lots of trees, and for every kilogram of carbon they offset they issue a certificate. I can buy one of these certificates, which effectively means I'm planting trees (by paying the company that plants them).

(There's another idea, known as "Carbon Capture and Storage". This hasn't (yet) been made to work. The idea is to freeze carbon dioxide and store it at the bottom of the sea, or pump it deep below the ground where it won't leak out.)

There are objections to carbon offsetting. In my opinion, fossil fuels are a much better carbon sink than trees, because they are out of the way. Trees, on the other hand, can be cut down to make way for farmland or towns. We can take land from farms and plant it with trees, but since the demand for food is the same it just means someone else will start a farm somewhere else, probably cutting down more trees to do so. So carbon offsetting doesn't work very well. Also, the trees planted are usually fast-growing trees like pine trees. So you get forests which are monocultures - in other words, there is only one type of tree, and relatively few other forms of life. Meanwhile, the trees that are cut down to make way for farmland (for instance) are often old, natural, tropical rainforests with many different kinds of plants and animals. And even with pine trees, it will be many years before the trees grow big enough to absorb the carbon they promised. This means there is more global warming in the short term. Additionally, there are many companies in the business of selling carbon offset shares. Some of these companies have a loophole that lets them buy already established trees and sell shares of those trees instead of newly planted ones. This is the fallacy of carbon offset, in that there is no net decrease in carbon emissions by new photosynthetic plant-life. Carbon offsets are analogous to the indulgences sold by the Catholic church in the 15th century. It allows rich people to pay for their "sins" rather than actually changing their lifestyle. Recently, celebrities have gotten on the bandwagon of carbon offset, including big-name music groups. The public relations boost comes from the implied idea that since the band is paying for trees to be "planted" to cover their tour carbon-costs, they are being environmentally proactive. In addition, when you book a plane ticket, many airlines have an option to offset your own personal carbon usage during the flight, for a small fee. The idea being that the average consumer can now pay a little towards their carbon "sins" and feel better about using the same level of carbon-based energy. For example, Al Gore's mansion in Tennessee uses 20 times more electricity than an average person's home (without even considering his other house or place in Washington DC). Instead of actually practicing what he preaches and reducing his electricity usage, he just buys carbon credits (or offsets) so he doesn't have to feel guilty about his extravagant, carbon-heavy lifestyle. (Not to mention that he buys the carbon credits from a company he founded and owns. In other words, he's paying himself.)

119120121
Catalytic Converters

What does a catalytic converter do?

Combustion engines produce, in their exhaust, a number of nasty chemicals. The purpose of a catalytic converter fitted to the engine's exhaust system is to convert these nasty chemicals into harmless ones to provent environmental pollution.

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Reduces the toxicity of internal combustion engine exhaust. It uses a catalyst and a chemical reaction to convert toxic combustion by products into a less toxic substance.

A catalytic converter takes the exhaust gas stream from the engine and breaks the noxious components of the exhaust down to less noxious or harmless components.

To reduce auto emissions.

The catalyst in a catalytic converter causes unburned hydrocarbons to oxidize. To do so, oxygen must be present in the exhaust mixture. If an engine is running well, there isn't really much for the catalytic converter to do. If the engine is in need of a tune-up, the catalytic converter may get quite a workout and in the process it can get very hot. Also, deposits can build up on a catalytic converter, making it useless. If the engine is running poorly, and a lot of unburned fuel is going out the exhaust, deposits from the fuel can build up on the catalyst. If the engine is burning oil, oil deposits can also build up.

It converts carbon monoxide, which is very deadly to all animals into carbon dioxide, which is not near as bad for the environment and it also helps prevent greenhouse gases because of this.

117118119
Emissions and Exhaust Systems
Catalytic Converters
EGR Systems

Can a bad EGR valve cause a catalytic converter to fail?

Short answer: YES!

Longer answer: The EGR valve is designed to recirculate some exhaust gas into the intake, in order to cool combustion temperatures somewhat. If the combustion temps exceed 1100 degrees (actually common in gasoline engines) then oxides of nitrogen are produced. these gases are what we see as visible smog. If the EGR valve fails, it can lead to very high exhaust temps which can gradually melt the insides of the catalytic converter. If a failed EGR is combined with a lean fuel mixture, or over-advanced ignition timing, the melting of the converter happens very quickly.

113114115
Catalytic Converters

Is there any asbestos in catalytic converters?

No

111112113
Fuel and Engines
Catalytic Converters
EGR Systems
Miscellaneous Vehicles

Will an autometer number 19304 tachometer work on a 20hp Kohler twin engine?

A tachometer works by measuring how many time a spark plug fires. If the tachometer is designed to determine the rpm of an 8 cylinder engine it will not show the correct speed of a 2 cylinder engine. If I remember correctly if the tachometer designed for an 8 cylinder is used on a 4 cylinder engine it will show twice the number of actual rpm. So an 8 cylinder tachometer used on a 2 cylinder engine will show 4 times the actual rpm of the 2 cylinder engine. If you check around there are special tachometers designed for 2 cylinder engines.

110111112
Catalytic Converters

What is the rattle noise coming from catalytic converter?

the substrate inside is breaking up,your cat-con is shot!!

105106107
Catalytic Converters

How does a catalytic converter removes carbon monoxide from car fumes?

It does not remove carbon monoxide.

979899
American Cars
Catalytic Converters
Fuel and Fuel Intake
Combustion Engines

Why does 302 2 barrel engine diesel?

I would suspect a bad needle valve and seat in the carburetor. The float level can also be set too high. I would replace the needle valve and seat and check float level.

I would suspect a bad needle valve and seat in the carburetor. The float level can also be set too high. I would replace the needle valve and seat and check float level.

777879
Catalytic Converters
Infiniti QX4
DIY Projects

How do you replace a catalytic converter?

You do not.

You did not state as to the year,make and model of the car as well as the engine size. I am a member of IATN and the majority of there fixes was related to someone installing an AFTER MARKET converter. There is a big difference. I strongly suggest that you go to a repair shop with the proper equipment as well as a very good tech to diagnosis the problem. You could replace parts and never fix the problem.jd1709

It is possible but highly unlikely as a catalytic converter should NEVER go bad unless something causes it. If you have a check engine light "ON" then I would have someone with the knowledge and equipment to diagnosis it for you. It will save you alot of money. Either a very rich or lean condition will cause a converter to glow red and seem stopped up.jd1709

the above answer is completely wrong

as in all car parts they wear out

a cat will clog up and/or become poisoned

if it is clogged it will stop exhaust escaping properly therefore makeing engine suffocate

any exhaust shop can replace cat converter

and any handy man can also replace cat converter

959697
Catalytic Converters
Grand Am GT
Photosynthesis

What needs to be repaired if you get the Code p0420 catalyst effeciency threshold low?

2000 HONDA ODYSSEY CODE PO420.WHAT NEED TO BE REPLACE? ANSWER XXXXXXXXXXXXXX Code PO420 is catalytic converter efficiency low bank 1, sensor1. You did not state as to the year,make and model of the car as well as the engine size. I am a member of IATN and the majority of there fixes was related to someone installing an AFTER MARKET converter. There is a big difference. I strongly suggest that you go to a repair shop with the proper equipment as well as a very good tech to diagnosis the problem. You could replace parts and never fix the problem.jd1709

959697
Catalytic Converters

Can a clogged catalytic converter cause an engine to backfire?

Yes, it is possible. It will also cause severe loss of power.

939495
Cars & Vehicles
Fuel and Engines
Catalytic Converters
Chevy Express

What causes an fuel injection engine to run OK when cold but then splutter at low revs when warm?

You might have a faulty oxygen sensor. Typically, when cold, the engine management system operates in "open loop" mode ignoring feedback from oxygen sensors because they don't work properly until they heat up to a specific temperature range. Once the sensors heat up, the computer goes into "closed loop" mode using the signal from the oxygen sensors to help adjust the air/fuel mixture. If one or more sensors are faulty, the fuel mixture may be incorrect and cause a poor running condition.

Another possibility is that you have a running problem which is noticeable when the engine is turning slowly. Air metering, EGR system, and mechanical engine problems are your most likely suspects here. When the engine is cold, the computer raises the idle speed of the engine to warm it up faster and to prevent stalling which masks the problem until warmup occurs.

== == -you might also have a bad distributer or a bad catalytic converter or muffler

939495

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