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Right after I got my car I was stuck in traffic in Chicago and the check engine light came on. I called the dealer's service department to make an appointment for the next day. The service manager asked if I had just filled up with gas. I had. He said it was probably the gas cap. Told me to retighten it and after so many starts (I think 3) the light would reset itself. Which it did. Saved me the cost of a service call.
BTW - Buick Regal GS 3.8 L V-6
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