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ECU light on all the time but engine starts & runs ok?

My engine management light has been coming on for a while, you stop the engine start back up again and the fault clears sometimes for a couple of months but its now come on and stayed on but the car still starts and runs ok any idea's

Dave
November 2009
Vehicles, CarsTime Starts Runs

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ECU Light On - Engine Runs OK? | Help & Advice