PDC Question

[BlueC2]

Has anyone had their PDC rear sensors fail intermittently? If so, any idea why?

Mine are clean and free from damage. Yet I sometimes get a failure warning.

[jonny996]

yrs put it in R constant beep, take it out & put it back in again , all ok. had two replaced last year, had to pay £60 for them to dyagnose which ones where faulty, not paying that again.

[chrisx666]

I had one go in my old 325 - it was the connector that was corroded. You can tell which one is faulty - park somewhere quiet, turn off the engine (leave ignition on) and put in reverse. Listen carefully by each sensor and you should hear a rapid clicking sound if OK.

(E46, newer ones may be different?).

[BlueC2]

It'll be tough to diagnose I imagine. I only get a failure message once in a while. The rest of the time they are working ok.

Does the bumper have to be removed to replace these things or they can be got at from underneath (mine's an E90)?

Are they relatively cheap to replace (to buy)?