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.
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1991 Mitsubishi Galant Question: check engine light
Answer #1Bret Bodas from RepairPal Test Shop, August 14, 2010, 12:13Master
If the idle speed is too low this can happen, does the light go out if you rev the engine up?
ReplyVisitor, August 16, 2010, 06:47
No, it just stays on all of the time.
Visitor, March 28, 2011, 09:13
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.