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Front wheel arch liner needs to come off (usually Torx head screws), and depending on location, engine tray too. Parts made by Valeo. Good opportunity to clean out annyway. Easy enough to prep yourself as Audi will charge small fortune for colour coded one. Make a mask template with card, lightly key PDC sensor with 1500 grit sandpaper, wipe sensor with isopropyl alcohol. First coat of plastic primer, couple of top colour coats and followed by a couple of clear lacquer flash coats. Read you can cure paint by popping in oven for a few minutes (without the rubber ‘o’ ring, but think I’d miss that part out, and just don’t jet-wash directly for a few weeks.

Hi all. Thanks for the advice about the fault. Back from Audi garage. Fault found with replacement switch I bought. They’ve done a diagnostic check and fitted new one. All OK now.

It's probably that then.

The new part arrived and wow what a difference! No matter how much I tinkered with the old one, I'd never be able to get it as good as the part so decided to go ahead and fit it. Having just done a road test, the difference is night and day. The new part is really rigid and doesn't creak at all, where as the old one was really flexible. For anyone else experiencing this issue, particularly with a 2-3 year old car, I can't recommend changing the part enough, the improvement is huge. It cost me £319 direct from Audi and arrived the following day and was very easy to fit.

Thanks that’s good advice