I had the same problem two weeks after delivery and 1,000 miles. I brought it in for service and they determined the LF short range radar sensor was incorrectly installed from the factory. Needless to say I was disappointed and I'm still wondering why the safety sensors functioned correctly for the first two weeks and 1,000 miles.
I made myself feel a little better with the 330i loaner. Let's just say I got a real good idea of what the car is capable of
