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Old 11-25-2008, 06:32 PM   #11
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Quote:
Originally Posted by sbortoloni View Post
What'* the difference between service and check engine lights?
If I remember right, Check Engine is triggered by an ECM fault, and Service Engine Soon is triggered by a maintenance reminder program (and possibly also by a fault).

I noticed on a rental Olds Intrigue I was driving once that during startup, when the warning lights lit up for bulb prove-out, the Check Engine would come on _before_ the engine started, and the Service Engine Soon came on _after_ the engine started.
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