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AudiRacerS4
11-16-2006, 08:37 PM
I have a check engine light for catalyst below efficency P0422 because the o2 sensor is bad. which 02 sensor is it pre or post cat and can it affect the performance of my car

smoothie
11-16-2006, 09:41 PM
i can't tell you which one it is but yes your car will run like shizz...

quickglx
11-17-2006, 05:05 AM
It's the O2 after the cat, and NO it will NOT affect the way your car runs. And it's on due to your testpipe.... Do you have spark plug foulers on there? I haven't had a CEL yet w/ mine...