s4 chip
#11
![Default](https://www.audiworld.com/forums/images/icons/icon1.gif)
I wouldn't worry about either of those 2 codes myself. The P0421 will just make you fail emissions testing if it is OBD-II, and you can't pass all the other tests. Other than that, it is totally harmless besides the annoying Check Engine Light or Maintenance Indicator Lamp.
Thread
Thread Starter
Forum
Replies
Last Post
Porkibear
S4 / RS4 (B5 Platform) Discussion
7
11-23-2005 06:21 AM
FAN OF F1
TT (Mk1) Discussion
15
04-26-2005 03:27 PM