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The check engine light coming on usually means that there is a problem in the emissions system. (including something as simple as your fuel cap being loose) If you take the car to Auto Zone, or Checker or any of the other major parts houses, they will read the computer codes for you at no charge. This will tell you what has failed or is being problematic.

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Q: What to do if engine light comes on for 2003 cadillac cts?
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