Check engine light
#11
Senior Member
True Car Nut
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.
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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