I bet the Check Engine LED has bee removed from the cluster board and the BMW tech missed this.... I'm guessing they wouldn't be checking for such a hack.

The only other alternatives are that a PCB track has been cut (again, hard to spot unless you are looking for it) or the operation of the LED has been blocked programmatically - which BMW's re-programming should have taken care of.

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Wayne
2005 BMW X5 3.0d (b 02/05)
2001 BMW F650GS Dakar (b 06/01)