Questions tagged [catalytic-converter]

Device placed within the exhaust system used to catalyze pollutant gasses found in exhaust gasses. Is normally located after the exhaust header, but before the muffler. Can be configured as 2-way or a 3-way: the 2-way affecting hydro-carbons (HC) and Carbon-monoxide (CO) gasses; the 3-way affects Nitrogen Oxide (NOx - do not confuse with Nitrous Oxide or NO2) as well.

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How do you diagnose a P0491 on a VW CC 2010?

Error Code P0491 is defined as Secondary Air Injection System Insufficient Flow Bank 1 I have a VW CC 2010 2.0L TSI Sport which has the CBFA version of the engine which basically means it has an ...
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Catalytic converter tests

Got a Mk 6 Fiesta with an engine light on, and showing a code for under performing cat or oxygen sensor. Connected a vacuum gauge to my intake port and it's pulling a very good level of 25. Might run ...
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Testing whether engine stutter/hesitation is caused by catalytic converter

I have a 2005 Ford Expedition, from my dad, which stutters and hesitates to accelerate. Sometimes it barely has a problem and sometimes it's bad. It has new spark plugs and spark plug coils which the ...
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Protecting the Mating Surface between the Catalytic Converter and Header

In the midst of replacing my Catalytic Converter on my 03 Nissan 350z, I have taken off the Catalytic Converter to reveal a pretty rusty mating surface between the two components. My question is what ...
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Catalytic Converter Clogged, But with what?

So, I've recently replaced my catalytic converter, bank 1 and 2. Both were a pretty penny (About $1,500 Each), I inspected the old catalytic converters and they look to have failed due to being ...
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2011 Chevrolet equinox check engine light

I got my 2011 Chevy Equinox back from the dealer for the engine repair on the oil consumption. This was covered by Chevy due to a class action lawsuit regarding this issue. Today, a week after getting ...
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Car wont go past 20mph before stalling out- 2003 lexus es300

timeline of issue: -battery light comes on -AutoZone employee says to replace the alternator -car won't start at night, so I get a friend to jump start it -while driving home the car starts to die....
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Potential for failing PCV valve causing intermittant p0420 (catalyst efficiency below threshold)

The car is a 2002 Honda CRV with the 2.4 VTEC engine. Had it about two years, and I've done a fair amount of maintenance on it at this point. It's got a nagging, intermittent p0420 code. And ...
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Check engine light, p0420 error and o2 sensor voltages

Good Evening, Some time ago I bought a used KIA ceed 2009. I've checked it with a mechanic who found it clean. The car was stationary for a long time and with little gasoline in the tank. I changed ...
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Are my cats bad? — secondary O2 sensor voltage

I have a 2002 BMW M3, and I've been trying to track down a poor fuel economy issue for quite some time now. My long term fuel trims are high (+7%-10%), and when I had the car on the dyno a couple ...
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What is the name of the socket that fits this type of stud?

I'm trying to replace the exhaust manifold on my 2010 Chevrolet Equinox (2.4L 4-cylinder), and there are studs which connect the catalytic converter to the exhaust manifold. I cannot, for the life of ...
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Error code P0421 - warm up Catalytic converter efficiency below treshold (bank1) - problem with Catalyst Monitor Bank 1? (Mazda 5, 2014)

I have Mazda 5, 2014, about 40K miles There is error code: p0421 - warm up Catalytic converter efficiency below treshold (bank1) Engine is not vibrating, so I assume this is not a problem with spark ...
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Faulty O2 sensor identification

The car is a 2006 BMW 325i (N52B25 engine). The problem started out as a performance issue (car didn't pull quite that hard), after a while it turned into more serious issues like low rpm stuttering/...
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Should catalytic material be between upstream and downstream o2 sensor?

I have just purchased a replacement catalytic converter. Using a flashlight, I can see the catalytic material inside the converter. When I was inspecting it, it looks like both the upstream and ...
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1994 Chevy 1500 loss of power slow acceleration what could this be

Chevy having slow acceleration when driving I was told it could be my catalytic converter could it be fixed by replacing with new exhaust system
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Want to clean EGR passages using shop vac, worried about debris from broken catalytic converter getting into exhaust manifold

I need to clean the EGR valve and passages on a 1998 Honda Accord 4 cylinder. Needless to say I would like to vacuum the debris out after scraping it up, the catch is that this vehicle possibly has ...
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Battery died a few months ago. Since then catalytic converter smog test not passed

I have an old 2000 Camry car that died in storage and so I replaced the battery 4 months ago. That reset all the monitors. Since bringing it back up it also had a check engine light which required me ...
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does straight piping your car remove catalytic converters?

I have a 2014 dodge charger hemi r/t. I'm looking to make it louder and i was just concerned about the cats being removed if I straight pipe it.
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How many catalytic converters does a VW CC 2010 2.0L Sport have?

I have a P0420 code on my VW CC 2010 and I've narrowed it down to a faulty catalytic converter. I have edited this photo to try and explain easier. In the red circle is the catalytic converter I ...
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Would a hole in the catalytic converter cause code p0420?

VW CC 2010. Catalytic converter was replaced when I first got the car at 78k miles. It is now at 83k miles. Downstream oxygen sensor was replaced at 80k miles. There is a small leak in the catalytic ...
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2003 Dodge ram 1500 4.7 v8

My 03 Dodge ram 1500 is cutting out, won't stay running. I've changed all 8 spark plugs and all 8 coils, I had to replace the breather box and assembly as well because my ex had tried to put a cold ...
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catalytic converter

i have 170,000 miles on my car, no problems driving, but my check engine light is on. i took it to a auto parts shop and it read that I needed a knock sensor or catalytic converter, so I changed the ...
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Is my cat dead?

My car is a 2003 bmw e46 with 2.2 petrol engine. Just bought an elm 327 Bluetooth scanner and did some testing with it. Below are some graphs made with ScanMaster app. This is lambda output voltages ...
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Nagging P0430 (and now a pending P0420 too!) 2004 Lexus ES330

I've got a 2004 ES330 (2nd owner) with roughly 315,000. We didn't pay much for the car in 2012 with 164,000 miles. So, i've never gone overboard in maintenance of it. A year ago, when it was time for ...
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Catalytic Converter self-service

Can I remove catalytic converter, remove loose fragments, then put it back on without harming vehicle? I have a 2003 Ford Windstar.
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Mercedes Benz Vito 116 cdi

Is it is safe to remove the "cat" in my vehicle? I have been losing power even after replacing the turbo.The cluster lights up the "diesel particle filter" sign. I have intermittent bursts of black ...
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Catalytic converter without heat shield?

My car was making a rattling noise when driving with very low RPM and slow, or very high RPM and fast. When cruising it was OK. Drove car to the mechanic and he said that cat is broken. He replaced ...
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dashboard light to replace catalytic converter, later engine loud dash light disappears

A engine checklght appeared on my 2004 Hyundai Elantra GT hatchback, and was diagnosed as a faulty catalytic converter, that was considered normal for the age of the car. About 3 days later when i ...
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Hi CO Emissions - Kial Soul+ 2.0L

My 2012 Kia Soul+ (53,700 miles) failed the emissions test for high HC and high CO at high RPMs (2500). After a new air filter, spark plugs, a professional injector and throttle body cleaning, the ...
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California CARB converter list by the CA Air Resource Board is no longer available

The only CARB listed converters by California is AP Exhaust 749233 Direct Fit and 740566 single replacement are no longer available. I called AP Exhaust and they are closed down and not sure if they ...
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Mechanic is recommending new catalytic converters. Are these temperatures that bad?

I failed a smog test in CA (1992 Corvette) and the results came back that the EGR valve is not holding pressure. It failed on nitric oxide emissions measured at 989 ppm at 15 mph and 1329 ppm at 25 ...
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Is there much benefit from removing catalytic converter? [duplicate]

This is a different question, that question is asking about the implications for an ecu after removing cat. I'm asking why people remove the cat to begin with and specifically what sort of bhp gains ...
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Interpreting secondary O2 values

The vehicle in question is a Piaggio Porter, make and engine data are unavailable atm. The car was in really bad shape before the repairs: missed oil changes, oil consumtion, heavy soot contamination, ...
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Why does my car sound like it has no catalytic converter when it hasn't been removed?

Well, my car suddenly started making a sound like if the catalytic converter was removed, which it has not. The noise started when my husband connected the a/c compressor directly to the battery ...
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Is my catalytic converter bad?

I have a 2006 Lexus LX 470 and I’m getting the check engine light on. I have a reader and I am seeing P0430 “ catalyst efficiency below normal (bank 2). I took some data from the sensors and plotted ...
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Putting the wrong fuel stabilizer in a motorbike

Say that a friend had been silly enough to skim the text on the bottle of fuel additive, before mixing it into a full tank of fuel for his 40'000 km kawazaki z750. And say that it turned out this ...
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Smog test not passing

I need to get my smog check to pass and when I went to the test center they said it wouldn’t pass because the “catalyst converter” is “not ready” (this is what they showed me on their monitor attached ...
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Should I replace my Catalytic converter?

My 2007 Xterra had the P0420 code pop on. My understanding is that it most likely that the Catalytic converter is going out. If this is the case, how high of a priority is it to fix? Before you ...
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Trying to Understand Post Cat O2 Behaviour During a Misfire

I've been researching using pre and post cat O2 waveforms to diagnose misfires and ran across this quote from the article, Intermittent Engine Misfire Analysis: Keep in mind that the downstream, ...
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Cat Converter Replacment & Sensors

I recently got a check engine light telling me that the O2 sensors had issues so I replaced them. The problem persistent, took it to make dealer and told it was the AF Sensors. I then replaced those ...
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02 sensor displays constant 3.3 volts, not a jagged waveform. 2002 rav4

Got P0420 and P0430 codes, suggesting the catalytic converter needs to be replaced. Everything I have read suggests the wave form after the cat ( sensor 2) should be a delayed version of before the ...
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Corolla exhaust + converter replaced: engine check comes on

About half a year ago I had to replace the front part of the exhaust on my 2003 Corolla. SInce on this model it is welded to the cat converter, it had to be replaced too. Shortly after my local ...
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Catalytic Converter: To What Degree Is It Self-Cleaning?

The title says it, almost. With the exhaust passing through the catalytic converter comes a lot more than just the exhaust gas itself. Carbon particles, greasy slime, you name it - all the stuff that ...
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P0430 (Catalyst System Efficiency Below Threshold) Toyota Camry 2005 V6

I have a 2005 Toyota Camry V6. The check engine light was on for while and I cleared it once using an OBD2 reader. It didn't come up for while. I used the .87 petrol and I thought that is what ...
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why can't catalyic converters mailed to california

Why doesn't California let other states ship converters to us residents? I'll have to pay outragest ca prices?
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Broken catalytic converter 7 engine damage

I have a 2017 vehicle that after 2,500 miles had the check engine light go on and went into limp mode. After 3 times in 2 different dealerships, it was diagnosed with a broken catalytic converter. I ...
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Can a car operate without a catalytic converter?

So I was reading this Quora question which answers in the affirmative, but here's my misgiving: I was under the impression that the oxygen sensor which the ECU uses to adjust the fuel-to-air ratio, is ...
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My 2002 Chevy Impala

Good morning and happy mothers day to all the MOM'S. I have a 2002 Chevy Impala and some months ago I noticed my gas mileage wasn't as good as it used to be. The check engine light never came on. ...
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Why have to concentrate on exhaust gas instead of inlet mixture in Indian Bikes for emission control [closed]

I am having Apache RTR 180 (carburetor version) . Having a question towards Bharat Stage (BS) (Emission Norms) against bikes. Recently went through BS specification. To achieve this, we are going ...
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Coolant in the cat, can it be saved?

The catalytic converter on a 2007 Mazda RX-8 is full of engine coolant. Is there any way this can be saved or do I need a new cat? It seems to me that coolant won't melt the cat like unspent fuel or ...