sorry to hear about the parking sensors... when you put the car into reverse.. does it make any beeping noise at all ??? if not then I would check the fuse... if you can hear a continous beeping noise then it could be one of the sensors faulty..
I also have parking sensors that don't work. When I put it in reverse all I get is a high pitched bleeping. The local dealers talking £ 250 plus so I make do without it. It would be nice to fix it though. Any thoughts Scotcruz?