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Q: Engine light stays on all the time on 2007 Cadillac DTS

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
The delivership put new gas cap on thinking it was it, but light came on again & stays on.
(1) Answer
It is necessary to retrieve the Diagnostic Trouble Codes stored in yours vehicle's computer to diagnose the problem.
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