Hi, I have a 2006 2 litre astra gsi turbo which has an intemittant fault where the engine management light appears, and will only go off when I shut the car off. I took it to the agents who replaced the bracket where the sim module is located. All was fine for about 3 months, now the engine light is doing it's magic dance again. The car has about 133000 kilometers on the clock. Can you perhaps help with an explanation?