Hi I have this 53' Fiesta (7000 mls from new!) which has a Bosch parkpilot revs sensor system fitted.
It has one long continous tone when you put it in reverse.
Dealer says its aftermarket but the owner says it was on it from new so I think that maybe it was dealer fitted before delivery.
Can anyone help with diagnosis please?
As I expected, the scanner doesnt see it.
If nothing else a description/wiring diagram would be useful.

Thanks a lot

Colin.