TheMike

I know the P0422 code has been discussed plenty on these boards so heres where i'm at. I got the same code (no other ones) about 2k ago and we determined that it was the CATs...had them replaced with universal ones and the code cleared fine. Just got the same code again the other day. As far as it appears the rear O2's are original but i cant tell on the fronts (they are probably original too). Should my next step be to replace the front 02's, or rear 02's or check something else out...

I dont want to just start throwing 02s at it since they are not cheap.

JAFO

first thing i'd do is find someone with a vag/com to read the O2 sensor output

TheMike

So w/ a VAG you can read voltage output or something? What should it be?

JAFO

<ul><li><a href="https://forums.audiworld.com/vag/">https://forums.audiworld.com/vag/</a</li></ul>