A4AdMan

Address 01
Controller: 8E0 909 559 D
Component: 3.0L V6/5V G 0004
Coding: 0016751
Shop #: WSC 63351
2 Faults Found:
16805 - Warm Up Catalyst: Bank 1: Efficiency Below Threshold
P0421 - 001 - Upper Limit Exceeded - Intermittent
16815 - Warm Up Catalyst: Bank 2: Efficiency Below Threshold
P0431 - 001 - Upper Limit Exceeded - Intermittent

It is the second time I have had this code trip (last time was 6 months ago) so I guess I should bring the car in to see whether it is 02 sensor or Cat related. Either way, we're starting this year off like '08 with this car, spending money on repairs. =(

GDawgA4

Time for some Miltek HFCs ;-)

The Beave

Feel you pain, had both of mine replaced last fall out of my own wallet, fingers crossed for faulty O2 sensors for you!

quattrothatcould

iirc Jimax just replaced one cat on his 3.0 and it was pretty expensive.

javanator

Bracketracer helped me out a couple years back with the VAG-COM procedure to see if my cat or 02 sensors were bad.

I have a 4-cyl (1 bank = 1 cat + 2 sensors). I would think that the test should work the same for a 6-cyl (2 banks = 2 cats + 4 sensors).

<a href="https://forums.audiworld.com/vag/msgs/13072.phtml" target="_new">Clicky</a>

Diztek

cat is warrantied up to 80k or 8 years IIRC

A4AdMan

I'm at 98K miles =(

A4AdMan

My extended warranty doesn't cover the O2 sensors or Cats. =(

A4AdMan

evening and the CEL didn't go on. Hmmmmmm.

quattrothatcould

And yay for it going away.