"ACC sensor obstructed"

Anyway I was nearly at my desitnation so ignored it (and wasn't using cruise anyway).

On arrival I nipped round the front and yes indeed, it was behind an inch of blizard snow

Cheapest fault fix I've ever had  RRS gone
Audi SQ5...Gone Audi Q7 S-Line 240 3.0TDI Gone
Audi A6 Allroad Sport 270 3.0TDI

I had something very similar on Sunday night. Put the car in reverse to park at home and the front parking sensors went mental, beeping continuously. Got out and there was a thick layer of snow and salt mixture covering the front end after my trip down the M1. Cleaned it and everything was fine.