Hi, I am in the process of buying a 316ti Compact. When I test drove the car it was lovely to drive, but I noticed as soon as I put the car into reverse the sensors starting beeping quite quickly (maybe twice a second) with nothing behind the car to set them off. When you put something very close the sound goes constant. The seller of the car is telling me thats normal operation but I dont think it is, I have a friend with a 330 E46 and his sensors dont start beeping untill something is about a meter away from the car. I 'd like to get this confirmed before I part with money as I can get the garage to rectify it. Any assistance gratefull!