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Q: check engine light on 1991 Mitsubishi Galant

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Why does "the check engine" light come on but no codes come up with a diagnostic check. Light was shut off but came back on within minutes of running. Car has 120,000 mi.
(2) Answers
(1) Comments
Make sure your gas cap is on tight and makes a good seal. We've experienced this two times and both times it was corrected by tightening the cap better.