One problem related to battery cable has been reported for the 2007 BMW 3 Series. The most recently reported issues are listed below.
My wife was driving in the left center lane of interstate 384 in manchester CT. The car stalled and she was hit from behind by 3 other vehicles. She suffered back and neck injuries. This is related to the recent recall of Bmws for a faulty battery cable. BMW would not acknowledge anything was wrong with the car. We traded the car in because we did not feel it was safe or reliable.