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The vehicle's computer has detected a malfunction that is either performance or emmissions related and has sent a sgnal to the check engine light to illuminate. To retrieve the trouble code(s), the OBDII has to be scanned. If you don't have a scanner, there are auto supply stores that will scan as a free service.

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Q: Check engine light on don't know why on a 2002 Ford Explorer Sport Trac?
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