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Check Engine light on 2003 Cadillac Escalade

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Check engine light comes on when the gas tank is below 1/2. Replaced gas cap and that seemed to help for awhile, but its doing it again? Any ideas?
(1) Answer
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Have you had the computer checked for codes? If not, I would start with that.

A computer code helps you know where to start testing.

Some of the retail parts stores will check your codes for free.
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