Section 5 (Engine Controls - Tests W/Codes): Introduction
WARNING: This page is about a different car, the 1995 Audi A6. However, it is still accessible from the selected car via links, so may be relevant.
If no faults were found during preliminary inspection, proceed with self-diagnostics. If no trouble codes or only pass codes are present after entering self-diagnostics, proceed to the TESTS W/O CODES article for diagnosis by symptom (i.e., ROUGH IDLE, NO START, etc.).