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There are a multitude of things that will cause the check engine light to illuminated. The only way to be certain of which one is to have the car's computer scanned for Diagnostic Trouble Codes (DTC's). You can have this professionally done at a local GM dealership, where you can have the problem fixed or you can take the car an Advance Auto or Autozone parts store and have the computer scanned for free. Taking to car to the parts store may not work because some of the scanners they use can only work when the check engine light is on constantly and the information given is generic to more than one make and model of car.

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Q: What causes the service engine soon light to come on intermittently on a 2002 grand prix?
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