It seems the parking sensors, (front and rear) are having a hissy fit on
my late 2001 (2002 model) A6. Usually if I put the car into Reverse
(it's an auto/tiptronic) the parking sensors automagically come on, the
light on the dash button fires up and the relevant intermittant>constant
beeping commences.

But now the beeping has all gone to shot, sometimes it beeps
intermittantly, sometimes it's a spiteful constant beeeeeep and
eventually the dash light switches from on to flashing.

I'm guessing it's got it's knickers in a twist and needs some sort of
reset, but I have no idea how and the user manual I have is in German -
not handy when I don't speak/read German.

Any advice?

PS: it's amazing how much you come to miss such toys, I'm reasonably
adept at parking, so it's not a huge issue, but it does help with such a
big car.