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It means the computer has detected a problem with the emissions system. The oil change had nothing to do with it. A loose gas cap can however cause this. Tighten the gas cap 3 clicks. You will need to have the computer scanned with an OBD2 scan tool, to retrieve the code. This code will tell you what part is being effected. Not what part is bad, but which one is being effected.

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Q: What does it mean when the Check Engine Light stays on the entire time while driving a 1997 Buick LeSabre and hasn't gone off after getting an oil change?
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