I've recently had a fault come up on the Parking aid module where it says park pilot malfunction and on rearing the dtcs it shows rear left sensor internal component failure, so I changed the sensor with a new one from Ford, the fault still exists... so I did some further diagnostics and when walking round my cat all the distances stay at 3m. So I'm guessing it's the module that's faulty but I cant find it for the life of me has anyone had anything similar? 

You can’t find the module ? 

Its behind the carpet trim in the boot right hand side 

1 hour ago, Tommo17 said:

You can’t find the module ? 

Its behind the carpet trim in the boot right hand side 

Is that for the front and rear sensors? 

22 hours ago, JPryer123 said:

Is that for the front and rear sensors? 

Yes if you have factory fitted front and rear it’s the same module for both

I would be checking the wiring to the affected sensor. If a sensor or wiring fault occurs it disables the whole system. That's why it shows 3m on all sensors. Wiring corrosion is common. I would unplug the wiring from all rear sensors and the multiplug. Unclip the wiring and have a good look off the vehicle.