I have a 2002 Audi A6 Avant Quattro with 3.0 engine. I am getting the following codes.

P0421: Warm Up Catalyst Efficiency Below Threshold (Bank 1)
C06EE: Unknown code
C0759: Unknown code

I am not worried about the P0421.

I am worried about the Chassis codes and cannot find anywhere that will explain what they are.

I just had a local guy change all the belts and I am afraid something got screwed up.

Does anyone have any idea what the chassis codes mean and they cause?