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I have an Audi a4 2005 it's catting on leaves after about 2kms what can b the problem

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What causes01 audi allroad 2.7 liter fault code p0421

this can either be a bad cat or o2 sensor its the after cat downstream driver side you can either replace the o2 sensor or buy a spacer from 034 Motorsports to get rid of this problem or get a tune alls it does is checking if the cat is there for emissions will not effect gas mileage. Owner of Audi A6 2.7T 2001.B2 S1 is drivers side pre cat

B1 = Passenger side
B2 = Drivers side
S1 = Pre cat
S2 = Post Cat Example s1:b1

Jul 14, 2014 | 2001 Audi allroad quattro

1 Answer

Audi 100 cat warning light cuming on

Try putting 2 cans of SEA FOAM into your tank and driving 100 miles and see if this fixes your Problem. The CAT needs to be at least 100 degrees HOTTER in the REAR. This will CLEAN the CAT and quite possibly fix your problem

Apr 16, 2013 | Cars & Trucks

1 Answer

I replaced the stock catalytic converter on my 2004 Audi A4 1.8T about 3000 miles ago with a direct fit model from MagnaFlow because my mechanic said the original unit had failed and I didn't want to spend...

The mechanic is yanking your chain and the following links will explain why cats fail
Audi A4 catalytic converter CHECK FOR PROBLEMS your mechanic can replace cats every couple of weeks or months depending on your driving style or he can repair the faults causing the cats to fail

May 13, 2017 | 2004 Audi A4

2 Answers

I'm getting 3 codes on my Audi A6 po118 Coolant temp circuit high input po421 bank one warm up catalyst below thresh hold and po431 bank two warm up catalyst below thresh hold.

I have about 15 years experience with Audi/VW. The coolant issue is more like the result of the ECM coolant temp sensor failure. The Cat code might be the front oxygen sensor on that bank and not the front cat. If you need more information about this repair please fell free to contact me at, I have over 30 years of automotive experience to assist you, thanks.

Mar 05, 2010 | 2003 Audi A6

2 Answers

CAT light comes audi a8 95

may need replacing or its beginning to block up,catalytic convertors have a porous honeycomb like material in them and with time they expire,in exhaust

Oct 21, 2009 | 1997 Audi A8

2 Answers


Sounds like the Catalytic converter needs to be looked at or replaced.

Oct 02, 2009 | 1997 Audi A8

1 Answer

Bad catalyc converter! audi s4 b6

Sounds like **** to me. Did they do a compression test to determine this? Cat Converter can't cause a misfire on one cylinder. It is more likely a plug, coil, or fuel injector. Get a second opinion!

Feb 27, 2009 | 2004 Audi S4

1 Answer

Management light Cat problem code

You mentioned a non genuine cat being fitted. That in itself is not too much of a problem, however, non genuine oxygen sensors are. There is a huge difference in quality between the genuine article and cheep alternatives on the after market. I very much suspect your fault code has been tripped by such a replacement part. Exceptionally complex engine management control systems just cant recognise the electronic info thats being sent by non-gen sensors, so its a false economy to fit these. Also one thing to bear in mind for the future is to avoid using super market fuels. Its a common belief that all fuels are the same and it all comes from the same tankers, etc etc. This is absolute rubbish. Its like comparing a 20 year old single malt Scottish Whiskey with a Happy Shopper bargain blend. It may look the same, but there's simply no comparison. Prolonged use of these cheep fuels will produce long term running problems. Also dont forget, there are pre and post catalytic converter oxygen sensors on your car, so the bills can get expensive. Good luck

Jan 16, 2009 | 2005 Audi A3

1 Answer

Rough downshift from second to first close to stopping. Transmission was rebuilt in March and Amcco appears reluctant to fix problem. According to them the diagnositcs do not reflect any transmission...

There is no connection between faulty cats and the gear box. If there is a warranty on the work carried out, I would pursue it through a main dealership or direct from Audi

Jun 13, 2017 | Audi AllRoad Cars & Trucks

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