Engine light stays on all the time on 2007 Cadillac DTS

The delivership put new gas cap on thinking it was it, but light came on again & stays on.

by in Alta, IA on May 16, 2010
1 answer
ANSWER by on May 16, 2010
It is necessary to retrieve the Diagnostic Trouble Codes stored in yours vehicle's computer to diagnose the problem.
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