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

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What can cause my check engine light to come on?
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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
Find Out Why Your Check Engine Light Is On
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