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You must be using a genetic code reader. They are often wrong on BMW's. If you want it diagnosed just give us a call 843-236-7846 we are glad to help.
it may be as simple as a belt. the AC compressor engages when the AC is on and throughout certain times when the heat or defrost is on in order to keep the compressor lubricated. it would be a good idea to have the belt and AC compressor checked.