A8CT

Dealer replaced both @ no cost under emissions
warranty. I pulled the codes before I dropped
it off and they were:

"Main catalyst" "efficiency below threshold"
this appeared for both "banks 1 & 2".

When I questioned what the codes were that lead them to replace the CATS, they told me the same thing. So, light is off and I think it's idling a bit smoother. I assume that this was the fix but I think I need to log about 1,000 miles before I'm totally convinced.

Bob
2000 A8

AgA8

How many miles on your 2000 A8? Any guess about whether it's mileage related?

A8CT

54k, no I think this is unusual - normally good for well over 100k

bpower1

way to go. nice for once for a second hand owner to benefit from the original warranty.

DWP

1000 miles after the emissions warranty ran out! Ouch! He's trying for a "Courtesy Warranty" job.

Paul_A8

Better now then after warr. expired. Do you know how much per CAT? $1000?