As my 01 A6 2.7T approaches 80k (79k right now), a CEL turned up. The code was P1131 (Air/fuel mixture issue). Is there any way I can find out if this is the o2, the catalytic converter, or both? The cat is warranteed until 80k miles and if this is the issue I would like to get replaced ASAP (before 80K miles). Please help!!

Thanks!

Dan

 

Are o2 sensors covered under the 8 year 80k mile emissions warranty?

 

anyone?