What can cause my check engine light to come on? on 1999 Audi A4 Quattro

What can cause my check engine light to come on?

Asked by for the 1999 Audi A4 Quattro
1 answer
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:
https://repairpal.com/directory?address=30236&car_brand_names=Audi