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there is a code set by the cars computer. you need to have the car scanned to see what the code is. alot of the times getting gas while the car is running can set a check engine lite. There is a difference between the service indicator light (yellow) and the check engine light (red). Also, to those people who say check the manual, we did. The manual gives the smallest description in the book for this light. It says to see the dealer service department. It doesn't give any examples as to what the problem could be.

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Q: 2002 cavalier yellow check engine light is turning on why?
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