Question about 1996 Cadillac DeVille

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My service engine soon light ccame on, but car runs great

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U will very seldom feel any difference when this light comes on, it comes on when one or more of about 200 electronic faults has occured in the electronic controls and sensors of the computer controled systems, these systems are the engine the transmission and the emission control system, you will need to have the system tested to see what code or codes is stored in the computers memory.

Posted on Jul 17, 2009

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