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Service Engine Soon light

(1992 Chevrolet Blazer)
in Flandreau, SD on December 09, 2009
When my truck idles for a few minutes, the Service Engine Soon light comes on and will not go off until I shut off the truck. What would cause this?
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Popular Answer
on December 09, 2009
This is the Check Engine Light, and there is background on what why it comes on and how it behaves here: http://repairpal.com/check-engine-light
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