My dad had a similar experience with one of his car. In NJ, all gas stations are full service. So, the guy at the pump didn't tighten the gas cap enough. Car threw the service engine light. I tighten it and drove it for 50 miles. Light went away and never came back.
Did you pump own gas or it was full service? Other than the gas cap issue, I really don't know what else it could be.
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