Apologies. Christmas got in the way of car fixing ;^)

Using NavCoder, It shows that only the two middle rear sensors out of the eight on the car, are reporting back as functioning.

To be very clear here: NavCoder shows all eight sensors, then when I select reverse - with the Ignition on - Engine Off, I see the two middle rear sensors change colour and start blinking between yellow & red on my PC. All other sensors remain blank (dead)

Using INPA, It shows All Eight of the sensors, as a black bar with no green bar. That tells me that INPA thinks that all eight are dead? I have tried to watch the screen as I stand right in front of the sensors waving my hand over them. This makes no difference to the black bars on the PC.

Conclusions:

I struggle to see how all eight (or even six) sensors can be dead. SO I am now thinking it more likely that the ECU is the culprit here.

- Both front & rear looms are connected at the bumpers and at the ECU.
- I have tried a brand new OEM sensor moving it's position in the rear with no change. (Apart from NavCoder see's it in the middle slots).

Again to be clear here: INPA says there are NO Errors in the PDC system and shows all eight sensors as solid black bars with equal distance measurements next to each bar. I can test the system, switch it on or off (it beeps in response) I can <select> "front & Rear" and the system gives the corresponding tones. But it says no errors.

My choices now are to buy another ECU, but I fear throwing money after money. Or, but another six OEM sensors. But I still struggle to see how six would fail all at the same time.

INPA seems very limited in it's capabilities. I had hoped it would allow me to select the ECU or switch on/off individual sensors? If it does? then I cannot find that option (and I have looked).

Fed Up....