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Old 02-24-2010, 10:54 AM   #1
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Default Code P0421 was NOT catalytic converter

I have a 2000 A4 with the 2.8 V6 and 139k. I recently had the check engine light come on and found it was code P0421. Most people told me it was the cats. I took it to a very reputable German car mechanic who said he's seen this in these Audi's and he felt that it was a faulty code, that the ECU parameters were too stringent.

Based on that info, I took it in to Audi and had them flash the ECU. That was about 1k miles ago and I haven't had the light come back on.
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Old 02-24-2010, 11:03 AM   #2
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Common issue and fix. There is a TSB on this. Lucky your tech was sharp enough to dig it up.
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2005 A6 Sedan Q 3.2 (wife's whip)
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1980 VW Scirocco (mid-life crisis car)
1983 Mazda RX-7 (revolutionary sports car)
2003 Mini Cooper S (just because)
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Old 02-24-2010, 11:06 AM   #3
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There was a TSB? Does that mean I shouldn't have paid for it? They charged me $189 plus another $50 to remove the radio to get the radio code.

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Common issue and fix. There is a TSB on this. Lucky your tech was sharp enough to dig it up.
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Old 02-24-2010, 01:47 PM   #4
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There was a TSB? Does that mean I shouldn't have paid for it?
No. Audi service sucks.

They issue a TSB instead of a recall so they can decide who pays and who doesn't. Unless you are the original owner and the car has been serviced at Audi, forget it.

BTDT with the local dealer and Audi of America.
Their contention: car is out of warranty.
My contention: warranty period not applicable since nothing is broken; car is functioning as designed. Design flaw should be corrected at Audi expense.
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Growing old is mandatory; growing up is optional.

2005 A6 Sedan Q 3.2 (wife's whip)
2000 A4 Avant Q 2.8 (daily driver)
1980 VW Scirocco (mid-life crisis car)
1983 Mazda RX-7 (revolutionary sports car)
2003 Mini Cooper S (just because)
1995 Mazda Miata, Superdupercharged(anti-Audi)
1999 Mazda Miata SSB (track beotch, no plate)
2003 GMC Yukon Denali XL (the anti-earth)
2004 Dodge Dakota (hey, at least it's stick and 4x4)
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Old 03-10-2010, 01:48 PM   #5
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Quote:
Originally Posted by dpeverhart View Post
Code P0421 was NOT catalytic converter : I have a 2000 A4 with the 2.8 V6 and 139k. I recently had the check engine light come on and found it was code P0421. Most people told me it was the cats. I took it to a very reputable German car mechanic who said he's seen this in these Audi's and he felt that it was a faulty code, that the ECU parameters were too stringent.

Based on that info, I took it in to Audi and had them flash the ECU. That was about 1k miles ago and I haven't had the light come back on.

That sucks that they charged you
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Old 03-10-2010, 01:48 PM
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02, 2000, 2002, 2004, a4, a6, audi, catalytic, code, converter, fault, p0421, quattro, s4, shows, vw


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