jumped in the car the other day and found the parking sensors have stopped working, the light flashes on the dash and when i put it in reverse i get one long bleep and then silent..
any one been there  V8 facelift Range Rover Autobiography 22" wheels.
1976 Harley Davidson Iron Head Sportster

Yep, my old D3 did this to me. Turned out to be a duff ECU but it can also be caused by a duff sensor. Worth checking if the wiring is chafed through as I've read about that one as well.

Hardest part is getting the bumper off to test it all. Good luck.

Dom.

Activate the beepers, and walk round and put your ear to the sensors, if they click there working. If all are working/clicking front and rear i would guess its the ECU.

The long beep and the flashing led indicate that a fault has been detected. Either the front, rear or both have been disabled. I would suggest that a sensor or the wiring is at fault on this one but as you have the fail indications you could plug it in and read the fault code. Other than that try listening for a sensor hat isn't clicking and that is the faulty one.

Steve 06MY 4.4 V8 Autobiography Cairns Blue with Navy & Parchment Interior

off side rear wiring normally gets chaffed dave..

This thread’s arrived just at the right time for me, mine has just failed and by listening for the clicking I’ve found one of the front ones faulty, just looks like a bit of a mare to get the bumper off, ah well, thanks for the info guys

looking at the rave pics , its possible you might be able to get to the sensors without taking of the bumper..

Cheers Stan, just noticed that after a search of PDC, that looks much more appealing!

The PDC ECU's are a complete pain in the ass. They seem very flakey.

When I bought the car the front PDC wasn't working so I replaced the ECU and they worked. After 6 months the system started going generally crazy so I put the old ECU back in and make do with just rear ones now.

Must be the BMW badge stamped on it  

Mine too, just have the rear ones.

Need to buy a new ECU to test.

jumped in the car today and all working as norm...i know if you hit them with the jet wash it can cause probs but i had not done that..but at the end of the day they are all working.  V8 facelift Range Rover Autobiography 22" wheels.
1976 Harley Davidson Iron Head Sportster

I need to sort the rear ones on mine, they beep as if something's really close to the car, really annoying as I'm realising how much I rely on them when parking  2006 Mercedes CLS
1991 Retro-style Mini
But really finding it hard to fight the urge for a S/C...

agreed mark, i use mine all the time ..

Just to clear this up. Rave may say that you can remove the PDC sensors with out removing the bumper but the newer sensors have to be removed from behind. The shape physically won't fit through the hole. Bumper removal on the front is very easy and only took me (an amateur) about an hour to complete the job.

See here for some guidance:

PDC

here is the missing picture from the post:

Click image to enlarge