A8CT

I think the mileage is a little less (80k?), 7 years sounds correct

JBowers

...my local Audi dealer refused to do it under warranty claiming that there were signs of external damage - the asking price from them to replace it was around $1200 if I recall correctly.

The independent muffler shop that replaced mine said that the dealers claim was BS.

Anyway, that is how I ended up with the code throwing non-OEM CAT.

AND, that is another reason why I hate my local Audi dealership.

SCL

...until I bought a pair of used ones with 100K miles on them...and now the car passes with flying colors -- like just a few ppm HC and CO2 versus values in the hundreds and 3-4 times the allowed emissions. The Cats were sold to me by a mechanic and installed as "re-cored" -- which I later found out meant that he had someone cut off the ends of the pipes and welded them to a pair of generic Cats -- for $600 ea! It never passed emissions. The first time, the mechanic got it to pass -- AKA he faked the results somehow - and made 500% profit on Cats that don't work. Two years later I went back to him and he claimed that the Cats must have worn out. I can't explain why they did not work...I have no idea. But I'm amazed at how clean a pair of 10 y/o used OEM Cats run. I ran into the same issue with the rest of the exhaust, paying $1000 for Stebro...only to later have to buy a used system off a '93 for $100. Something about that OEM exhaust -- it's solid and IMO not replaceable with after-market. Although...this story applies to the S6 2.2t, not an A8.

see pic.<ul><li><a href="http://pictureposter.audiworld.com/100685/dsc04577-withtxt.jpg">http://pictureposter.audiworld.com/100685/dsc04577-withtxt.jpg</a</li></ul>