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Well no code came up so does this mean a trip to local purgeot garage and have an expensive diagnostic check on their machine?

The Engine Autodiagnostic light has come on on the dash came on during a 187 mile trip home. The car is running very well and so not sure what this is. Can anyone enlighten me as to what this autodiagnostic cover yes I know its the engline but what could make this light come on? :roll: Purchased thi...