VAG Com Help..

[BeEmAcK617]

HI everyone,
Need some help with the car.

I have a 3.0 Tiptronic A4 with about 58K on the dash. My CEL came on and when i checked it with the vag this is what it tells me..

Address 01 -------------------------------------------------------
Controller: 8E0 909 559 L
Component: 3.0L V6/5V G 0020
Coding: 0016751
Shop #: WSC 63251
1 Fault Found:
16805 - Warm Up Catalyst: Bank 1: Efficiency Below Threshold
P0421 - 001 - Upper Limit Exceeded
Readiness: 0000 0000


This is what i got when i did the readiness check



I figure its the O2 sensor but not sure which one i should change, any help would be appreciated

[BeEmAcK617]

Did a little more research and i guess my car will be at Audi for some warranty work.

[FourRings80]

this might help:
http://wiki.ross-tech.com/index.php/16804/P0420/001056

o2 sensors test: last part in "understanding oxygen sensors"
http://www.audiworld.com/tech/eng.html