Other control units had similar data fault codes relating to the CCU. As the car had a tow bar fitted i checked for tow bar programming. It turned out that the tow bar was fitted the old fashioned way, without the LR tow bar control.
I used the Westfalia tow bar programming device to check the tow bar coding. It showed 'un-programmed'. I re-programmed for 'no tow bar fitted' and the fault codes vanished in the various control units and the parking sensors started working again.
I have to wonder what changed the programming in the first place though...
Cheers,
Job
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