Hi any Tech's have an answer for this snag.
3dr Sierra Cossie, car good as gold as usual when last used, got in it today Engine Management Light stayed on??? Damn!!

Went for a short drive, surely it would either drive or not. Drove perfectly, full performance, boost etc, got too where we were going with no problems. When leaving this stop, start car light went out. Another short drive, light stayed out. Another short stop, started to come home light stayed on, switched engine off, then started again, light went out, any idea's folks. Long winded description i know but thats all the facts.
What would give you an Engine Management Light on, but the car runs perfectly?

Advise Please.