Ford focus mk2 parking sensors

[mattware49]

Hi Guys. 

I have a 55 plate focus 1.8tdci with factory fitted parking sensors. The parking sensors don't seem to be working consistently.  Occasionally you will hear a very quiet (like you need a dogs hearing to hear) humming/high picked noise. Is there a volume control on it or any suggestions where to start looking on this.

Cheers

Matt

[Tdci-Peter]

5 hours ago, mattware49 said:

55 plate focus 1.8tdci with factory fitted parking sensors

On my 56 plate, the parking sensor module is in the boot, on the driver's side, near the back, behind a little cubby hole on my estate. It goes direct to a little speaker mounted on the door pillar by the rear seat. No volume control I ever found.

It started squealing at me all the time when reversing. Faulty sensor, but it was about £100 (or something absurd) for a Ford sensor, so I replaced the whole system with a cheap one (well under £20) off eBay.

May not be as sensitive as the original, but I have had no problems with it.

Peter.