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Any faults stored by the DME? If main relay is not grounding DME is faulty considering that all inputs to DME are ok and wiring harness is not damage. Check ignition coils and injector resistance before ecu r/r. I think 1999 have MS41.1 DME'S you can't installed used DME as they get married to EWS once they are flashed and sync to EWS
Sent from my Nexus 7 using Bimmer App
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