I think this is the guy who did his own head gasket so the harness is probably pinched or damaged behind the cylinder head/valve cover. Might be wise to check for something obvious before getting into the Ebox and cutting wires.

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1988 325is (purchased new) sold
2004 X5 3.0 2005 X3 2.5
2008 X5 3.0 (new to me)