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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Downstream O2 sensor shows lean but LTFT is negative

I have a 2011 Chevy Traverse with a P2099 CEL that I can't get to go away. I used an OBD scanner to watch the live O2 and fuel trim data. The downstream O2 sensor on bank 2 (side that P2099 refers to) ...
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Why are some specific makes of car particularly vulnerable to catalytic converter theft?

The Guardian is reporting that catalytic converter theft is an increasing problem, with knock on effects on insurance. The particular example is of LV= which says of a discontinued insurance policy: ...
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Driving without the second lambda sensor

I recently had a problem with the catalytic converter in my Nissan Pixo (UK Registration) and Mechanic told me to replace it. I usually buy original spare parts for my car from India as my car was ...
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Cat converter goes bad

Volvo S60 fuel pressure sensors replaced, 500 miles later my catalytic converter started smelling awful. Is there a connection?
Foneguy's user avatar
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Trying to figure out cause of P0420

2007 Hyundai Elantra GLS -- bought it used and previous owner said he installed a new catalytic converter before I bought it from him. Passed smog when I bought it. About 6 months after I bought it ...
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Do catalytic converters have an adverse affect on gas mileage or engine lifespan?

Do catalytic converters have an adverse affect on gas mileage or engine lifespan? It would seem it takes extra energy to operate the chemical reactions occurring in a catalytic converter, thereby ...
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Will fixing first OBD2 misfire codes resolve the cascade of others downstream?

Looking at a car my kid wants to buy. 2012 Honda Civic LX. One owner, some service records, seemed to run fine in test drive. No colored exhaust gasses, no dashboard lights, sped on freeway, sudden ...
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BMW E90 N52 catalytic code removal

I want to learn how I can clear catalytic code removal forever. What software I can use and what tools ?
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How does CO poisoning still happen with newer cars?

I'm learning about catalytic converters, and learned that a car with a functioning converter doesn't output carbon monoxide (CO) because it converts it into carbon dioxide (CO2) and water (H2O). How ...
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2013 hyundai sante fe sport No Crank/No start

So my 2013 hyundai santefe started having a flashing check engine light and wouldn't accelerate past 2000rpms on my way to work one night. Pulled off the road into a parking garage. Please note at ...
Ploegstra 96's user avatar
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06 Accord Stolen Cat Causes Worse MPGs?

my catalytic converter was stolen. Because of this, my car now smells like gas and gets worse MPGs. I do city driving and now after a mechanic straight piped the car, I get about 23 MPGs as opposed to ...
Mo Akashi's user avatar
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Is high HC reading a legitimate reason to refuse catalytic converter warranty claim?

Original problem P0420 fault code high CO readings (1st fast-idle test, UK MOT emissions report) The vehicle is a 2006 Honda with a K20-series petrol engine, and the catalytic converter was a non-...
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Land Cruiser did not pass emissions

I have a 2002 Toyota Land Cruiser that did not pass the smog test because my catalytic converter needs data. My battery was changed two month ago. How can this get fixed?
arla norton's user avatar
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What is so special about catalytic converters that makes them a target for theft?

Recently, in New Jersey, people have been stealing catalytic converters from cars. Why are people stealing this specific part all of a sudden? It happened to 4 people on my parents' street. I am ...
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What engine code appears if catalitic converter is removed?

Someone stole a catalytic converter for my car. What code should reflect during diagnosis? I currently get P0401, and P0403.
Mapoloko Moeketsi's user avatar
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Help catalytic converter

Hi I have a 2005 Honda Accord 2.4l I need a cat for it to pass smog I found a 2009 Honda Accord v6 with a cat for sell would that fit my Honda ?
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P0420 In Honda Civic or any other car

Just want to know about P0420 code in any car and specially in Honda. Does that mean only that catalytic convertor is bad or any other reason too?
Ali Choudhary's user avatar
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Stolen catalytic converter -- safe to drive to mechanic?

A friend's catalytic converter was stolen, her mechanic is about 35 miles away. What are the risks of driving the car to the mechanic (instead of having it towed)? I'm assuming that it would be ...
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How viable is it to decat a Lotus Evora?

The Evora has a secondary decat kit, but no primary decat kit. How viable is it to fully decat an Evora? The main problem I foresee is tuning. It uses the Toyota 2GR-FE V6 engine. Does this engine ...
Cooter Davenport's user avatar
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Removing Broken Bolts

Yesterday I ventured on replacing a failed catalytic converter on my own on an 02 Nissan Pathfinder and it was smooth going until a couple of the bolts broke when removing the old cat. This would have ...
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BMW 118i 2008 N43 petrol engine, catalytic converter removed consequences?

I just bought new used car(140k km) and turns out I have CAT gutted out by the person which sold me this car.. Car runs fine, no strange noises and doesn't feel numb or laggy for me. Only thing I ...
Vytautas Šerėnas's user avatar
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Did I get the right catalytic converter for my Honda Odyssey?

There is an engine code on the bank 2 catalytic converter in my 2007 Honda Odyssey EX-L, I paid for a diagnosis from a mechanic and they recommended replacement of the bank 2 catalytic converter. I ...
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ECU shielding/ Highway driving

Ok, two qs I was wondering about (completely unrelated): How are ECUs and electronics shielded from all the heat that a car generates, especially when the car is driven in hotter climates (i.e Middle ...
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Why does a catalytic converter have to connect to the engine electronically?

Recently I had to get the catalytic converter in my automobile replaced because it was stolen. The repair shop said that to do it properly, and have the engine light go off, they have to use a more ...
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New catalytic converter on Suzuki Sx4 leaks at connection to header

I'm working on my friend's Suzuki Sx4, 2007. I diagnosed the front CAT as the problem, ordered a new one, and installed it. The car starts up and sounds okay until you give the engine some gas. Then ...
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Does anyone the location of the serial numbers for 2004 CARB Subaru Outback Catalytic Converters?

I replaced most of my exhaust system a few years ago (catalytic converters and O2 Sensors) because of a P0420 error. My car came from a state that required the vehicles to meet strict emissions ...
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Suzuki SX4, P0134/ P0420, sensor or CPU?

So, my friend is having car trouble with their Suzuki SX4, 2007. I was told the car had some issue with the catalytic converter in the past. The mechanic told them it would cost $2000, but that it ...
user64947's user avatar
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1 answer
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Citroen C2 Catalytic converter replaced with patches

I just had a new catalytic converter fixed by a local mechanic and there are few patches visible. Wondering if this is sloppy work and might cause issues soon. Could any one help me understand if this ...
PMan's user avatar
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Does engine oil compensate below-threshold Catalytic Converter performance?

I have a Toyota Yaris 1.3 VVT-i with 2SZ-FE engine. The car has 100K of mileage (I recently bought it with no service history). Most importantly, its check-engine light is on for "catalytic ...
Ali's user avatar
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Replacing catalytic converter from cut pipe

How would I go about replacing a catalytic converter (2003 Honda CR-V incidentally) when the exhaust pipes were cut as shown in the following pics? Can I mount it somehow without welding it? Most of ...
gcr's user avatar
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High voltage on downstream O2 sensor after driving, but low voltage on idle

After driving on the highway, my downstream O2 sensor voltage was a steady 0.8V, which is high. On the other hand, when idling before the drive, it was a steady 0.3V. Is it normal for the downstream ...
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Painting a Front Catalytic Converter — Bad Idea or Not?

I need to replace the front catalytic converter on my 2006 Suzuki Aerio. The part came in bare metal, no paint or any coating is visible or possible to feel on the surface. Should I not paint it to ...
Igor Soloydenko's user avatar
3 votes
1 answer
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Replaced my 5 cylinder Volvo V70 2.5l turbo engine with a 6 cylinder S80 2.9l twin turbo engine and I'm having trouble with the exhaust

Replaced my 5 cylinder Volvo V70 2.5l turbo engine with a 6 cylinder S80 2.9l twin turbo engine and I'm having trouble with what to do about the exhaust. The original 5 cylinder had only 1 turbo, 1 ...
Adam Dahlvang's user avatar
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I have a 2000 ford contour 2.0 runs fine but will not get any faster then 40 mph no matter how much throttle I give,

Motor runs fine transmission shits fine has full rpm range all gears but at 40 it will not run any faster no matter how much throttle you give
Beau's user avatar
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2 answers
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Does cat removal disable check engine light?

If you remove the cat I imagine the ecu would have been reprogrammed to make it ignore o2 sensors readings? If so would this be considered a remap? When Changing the ecu in this way would it cause ...
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Do I need to replace my catalytic converter or it could be exhaust leak?

I have WV Polo 1.2 petrol from late 2005 with 170k. Recently I got the check engine light and I went to non official repair service (since there isn't one in my country). They told me it's the oxygen ...
lowselfesteemsucks's user avatar
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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 ...
Jo Smit's user avatar
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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 ...
Altimus Prime's user avatar
1 vote
1 answer
118 views

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 ...
Copy and Paste's user avatar
2 votes
3 answers
604 views

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 ...
James Vargan's user avatar
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505 views

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 ...
Jennell Eckroad's user avatar
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0 answers
629 views

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....
helpNeeded's user avatar
1 vote
1 answer
80 views

2014 Cruze Diesel

can't find replacement converter for car GM not making at this time been in dealer ship since Nov. can the converter be reemed out and reinstalled or will removing the back pressure cause low power ...
Hoyt Curtis's user avatar
1 vote
1 answer
5k views

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 ...
dimpep's user avatar
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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 ...
user9999's user avatar
6 votes
1 answer
551 views

What socket fits the Catalytic-converter-to-Exhaust-manifold 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 ...
R. Gosman's user avatar
1 vote
1 answer
764 views

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 ...
Steve V's user avatar
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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/...
galingong's user avatar
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6 votes
1 answer
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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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