Greetings, I have a 1999 A6 Avant Quattro 2.8 30V with 160K on it. Its never run better but had the Check engine light lit. I pulled the error codes and got P0422---P1392---P1519
I have the list of Probable causes and I'm not doubting them but I figured I ask in here and see if anyone with more knowledge has any advice on any of the codes. As I said the car has never run better and shows no sign of a malady other than the error codes. Thanks!

 

Catalyst efficiency - happens as the cats get older, search the forum for ways to get around this
Camshaft position sensors and actuator - relatively easy to replace, might be a false error caused by wiring issues if the engine is running well.
Jim

 

Thanks, I'll poke around and see whats in here about it!