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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. |
Common issue and fix. There is a TSB on this. Lucky your tech was sharp enough to dig it up.
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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.
Originally Posted by 4Driver4
(Post 23932205)
Common issue and fix. There is a TSB on this. Lucky your tech was sharp enough to dig it up.
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Originally Posted by dpeverhart
(Post 23932208)
There was a TSB? Does that mean I shouldn't have paid for it?
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. |
Originally Posted by dpeverhart
(Post 23932200)
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 |
I'm having that problem with my A4 right now. I just contacted the dealer and they told me they are no longer doing the flash. Is there any way to take care of it myself? I'm going to try the spark plug defouler trick to see if that works. The dealer wanted to just replace the cats. I guess there wasn't enough money for them in just resetting the parameters.
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Originally Posted by rpmccas
(Post 24612302)
I'm having that problem with my A4 right now. I just contacted the dealer and they told me they are no longer doing the flash. Is there any way to take care of it myself? I'm going to try the spark plug defouler trick to see if that works. The dealer wanted to just replace the cats. I guess there wasn't enough money for them in just resetting the parameters.
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