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Originally Posted by Markgc
In the meantime can't you clear the light and take the vehicle straight in for the inspection especially as the light doesn't seem to come back on again for about a week.
Mark
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Once the light is cleared the I/M readiness monitors are also reset. Most states now will fail a vehicle for emissions in the I/M rediness monitors are not all set to pass. thats why his light comes on later, one of the test finally runs and probably sets the light. If you want all the I/M monitors to try there tests you need to complete the GM drive cycle.