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07 750Li won't start

7 Series - E65 / E66 (2002 - 2008) - Bimmerfest - BMW Forums - www.bimmerfest.com
I replaced the motor in my 750 Li and cranks but won't start. I sent it to a BMW shop and they said it has a rolling code so it could be the key or the ecm. Both are expensive as heck so what would be the probability of it being the key? I have a repair diagnostic software and it is saying that the Car access System (CAS) contains the data for the EWS random code that is sent to the ECM on starting up. Should I go with a new key?
Date: Aug 13, 2017   


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