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What would cause the check engine light to activate on a 1989 Ford Mustang that seems to be running fine?
Wiki User
∙ 17y ago
The Computer Monitors nearly 100 or more sensors at a time. Your check engine light will illuminate when one of these sensors reads "out of tolerance". This could be benign, or it could be the start of a serious problem. You could pay a mechanic to read the stored computer code for you ($50-90 on average), or you could buy a OBD-II code reader from a parts store ($100 on average) and read it yourself. You can also look up codes on the internet for free. For a 17 year old Mustang, could be anything from a bad O2 sensor to a developing knock.
Wiki User
∙ 17y ago
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