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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1answer
101 views

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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2002 saturn sl1

my 2002 saturn sl1 loses power while driving for.the most part will not accelerate over 35 jerks when the accelerator is pressed what could this be can push gas pedal to floor and it still will not go....
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Can I use a CCTA catalytic converter on a CBFA engine if I live in Georgia?

VW CC 2010 2.0L Turbo (Sport) CBFA SULEV My car is a special variant of the normal VW CCs where instead of the CCTA engine I have the CBFA engine which basically means it has 2 catalytic converters ...
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2answers
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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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407 views

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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77 views

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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28 views

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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42 views

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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3answers
970 views

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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2answers
52 views

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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1answer
223 views

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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2answers
222 views

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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2answers
77 views

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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1k views

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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1answer
421 views

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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4answers
12k views

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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139 views

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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686 views

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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2answers
2k views

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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246 views

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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1answer
1k views

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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3answers
25k views

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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1answer
44 views

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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1answer
64 views

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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3answers
3k views

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 ...
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Welding, Repair, or Patch Catalytic Converter Crack

I got rear ended and the exhaust pipe was mashed forward causing the crack in my Catalytic converter's weld. Or perhaps, it just worsened the crack if it was too small to notice before. The crack does ...
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614 views

Catalyst Temperature

Please refer to Catalyst Temperature PIDs (mode 01 pids 3C, 3D, 3E, 3F) for the following questions - https://en.wikipedia.org/wiki/OBD-II_PIDs#Mode_01 Q1. Is there a thumb rule that the catalyst ...
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What's the purpose of having the cat right after the exhaust manifold

In a lot of the cheap cars I have looked at their exhaust components, I always find the catalytic converter right after the exhaust manifold instead of being after the down/front pipe in a "typical" ...
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1answer
581 views

Can a catalytic convertor be to small for an engine?

My car, a 2L BMW e34, failed its MOT on the gas test for CO readings. The tester said he thought it may be the cat had failed. I put a brand new exhaust system with cat and oxy sensor on my car, new ...
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2answers
7k views

Will eliminating factory catalytic converter have effect on emission testing?

I'm not exactly a car guy or know much about cars, but I would love to get some performance headers installed. The problem is that the headers that I found for my car state the following "Eliminates ...
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1answer
3k views

Incomplete Catalytic Converter Monitor on otherwise flawless old Tacoma

I have a 2000 Toyota Tacoma with 250k miles on it that runs like a champ. But, after some repairs, the catalytic converter monitor (or catalyst monitor) has never set. Every mechanic has told me ...
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0answers
967 views

P0420 Catalyst efficiency below threshold bank 1 With CO emission only!

I saw this code in OBD2 scanner on Skoda Fabia 1.2 2006 64hk petrol. It doesn't matter to me except that the car failed the inspection and I'm not allowed to drive it any more. The problem was too ...
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1answer
5k views

Engine misfires when car hasn't been driven for a couple of days

My 2001 Hyundai Elantra XD suffers from misfires during the first 5-10 minutes after starting the car. After this, the car runs as as it should. I'm not sure, but I think the misfires only happen when ...