So this morning I noticed the audible warning for the rear parking sensors was very quiet and now is completely silent. The display still shows the distances to what I'm going to hit when I'm reversing but I also get a message saying "optical parking assistant not working ".

Have any of you come across this before or can anyone shed any light on this problem?

Hi,

If you can, do a DTC check.

I had this a week or so back. Information I found is in this thread.

 

System fitted depends on trim but loosely, if you have sensors front and rear, and you have the Park-Assist system you have 2 sounders. Front one behind the dash pod, can be got to via the mini glovebox to the right to the steering wheel. Rear one is on the main crossmember at the top of the D Pillars, just up behind the headliner.