What can cause my check engine light to come on?
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1999 Audi A4 Quattro Question: What can cause my check engine light to come on?
Answer #1Superbob April 26, 2011, 16:29Master
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.
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