1991 Mitsubishi Galant Q&A

1991 Mitsubishi Galant Question: check engine light

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. -
Answer 1
If the idle speed is too low this can happen, does the light go out if you rev the engine up? -
Comment 1
No, it just stays on all of the time. -
Answer 2
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. -
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