I have just purchased a 2nd-hand 2006 S-Type SE D Autom, but it has a problem with the Rear Parking Sensors. When in reverse, there is no sound when near to the wall/fence on my drive, but when in drive and neutral, they beep !! Any ideas what the matter could be please ?? For now, I have disconnected the Parking Assist box in the boot, but I would like to get it fixed as soon as possible. Thanks in advance.