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Unfortunately this is a difficult one to diagnose, there are hundreds of possible fault codes that can be detected to bring this light on, although having the car put on diagnostics is the first step, the garage should have given you a printout of the fault code, with the help of this code I can pinpoint a possible cause.The garage have done a simple re-set which is the first step in diagnosing the problem as often the fault is a one off that will go away and stay away, if the light came back on after 12 miles this confirms that the fault is still active and now will need to be plugged in to be scanned again to confirm it is the same fault code and the fault can be looked into based upon the results of the scan.
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