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A check engine light is usually a fail safe indicator that lets the driver know their is something wrong in the engine system. Most check engine lights can come on from something as minor as a gas cap being loose or something as major as pending engine failure. The best thing to do is to test the engine with a code reader in order to see if the vehicle should be driven.

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Q: Check engine light came on while driving in a 2003 ford focus svt?
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