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MY SERVICE ENGINE SOON LIGHT HAS COME ON, WHAT COULD BE THE PROBLEM? on 2001 Cadillac DeVille

IT JUST STARTED A DAY AGO...I LET IT RUN LOW ON GAS AND IT STATRED AFTER I FILLED IT UP.

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Could any number of things....but the simplelist thing that could relate to filling up with gas is leaving gas cap off or loose. Check that first. If the cap is loose after gettin it tight it will probaly a few days before the light will go out.