Section 1 (Engine Controls - Self-Diagnostics): Introduction
WARNING: This page is about a different car, the 1993 Audi 90 and 1993 Audi 100. 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 fault codes or only pass codes are present after entering self-diagnostics, proceed to see the appropriate TESTS W/O CODES article for diagnosis by symptom (i.e. ROUGH IDLE, NO START, etc.).