What can cause my check engine light to come on?
Audi Q&AAsk Your Question
1999 Audi A4 Quattro Question: What can cause my check engine light to come on?
Answer #1Superbob April 26, 2011, 19:29Master
The check engine light indicates that the computer has detected a malfunction in the engine/emission control system and has diagnostic codes and data stored which would be essential in diagnosing the problem.
A technician with a scanner could access the diagnostic codes and data and then be able to give you a diagnosis.
If you want to find a specialist, here's a directory link for you: