I have only seen cases where the DME had corrosion from coolant leaking down the wiring from the tstat connector making it's way to the DME and causing a fan activation issue. I have also seen on a higher mileage e39 540i the vanos solenoid allowing oil to leak through them, down the wiring into the DME connections as well. There would be obvious signs of an issue when physically checking the DME connectors...

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02 Imola on Black Dinan S2 4.6iS
00 RoyalRot on Sand/Black 740i Short Sport