i bought an e60 525d last Monday and managed to catch the front bumper on a kerb whilst reversing... It pulled the front bumper part off but it clipped back in with no apparent damage. The fogs etc work fine but 3 of the parking sensors have stopped working. I am thinking that i probably disonnected them when i did the bumper so can anyone tell me how i would go about checking and reattaching them? Many thanks.