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There can be many reasons for the check engine light to be on. The best you can do is to go to service to read the engine problems from the computer. Auto Zone use to do that for free. Thry also use to have a booklet with possible problemes according the computer error mesaje

IS THEIR A LIGHT THAT FLASHES TO READ CODE UNDER HOOD?

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Q: Mercedes C280 1997 check engine lights is always on what could be wrong?
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