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Q:

Service Engine Soon light on 1992 Chevrolet Blazer

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
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?
(1) Answer
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