Friday morning when I put my car into reverse there was a new sort of bleep as the sensors fired up - just a high pitched continuous beep, and no reverse camera.
A message appeared on screen - Park Aid Unavailable - Please consult your dealer.
When I got to work, I disconnected the battery and did a hard reset. This did bring it back to life at the time and worked again for the rest of the day.
By yesterday (Sunday) it had stopped working again, but has fired up once so far today, but not at other times.
There's clearly some intermittent fault there - anyone have any idea what to look for?
Car is MY13 HSE Lux

I have sensors but no cameras my first thought was check all the electrical connectors are well seated or pull them apart and refit. Take the appropriate fuse out and push it back in. I’m thinking this as a hard reset sorted the problem for a while.

This was my first thought as well.
Anyone know where the module for the sensors is located?

There’s a workshop manual on here somewhere I’m pretty sure.

https://www.freel2.com/forum/topic10621.html

Links to the manuals/handbooks. 2007 TD4 HSE

I managed to replace one sensor.