and your car has its own built-in code reader/scanner system. Use the sticky post just above this in the Deville forum - "How to pull codes". Study and use the proper year/car group for OBD-II. --------hang on ........
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the check engine light only illuminates when there is a problem -
so - you don't want to simply shut it off -
you need to find out WHY the light came on -
and you don't need to take your car anywhere to read the codes -
you have a built-in scanner - so you can do it yourself -
to check for Diagnostic Trouble Codes -
if you don't know how -
go here and read the ENTIRE post -