C5 X7 rear parking sensor fault

[jml]

I’m experiencing a very similar problem with the rear sensors of my C8.

I had the same issue last year with the front sensors and despite changing all the sensors and the ecu the problem remained. Then, suddenly and for no apparent reason, it fixed itself ! (I hate problems that ‘fix’ themselves as you have no idea what it really was).

Now I have the problem on the rear

[aerodynamica]

Could try giving them a clean? I tried that first although obviously wasn't the issue!