Thanks to all the advice here! I posted on 21 April as my 2016 A4 Avant showed same fault. Local Audi dealer couldn’t fix it till June(!) unless I got the car ‘recovered’ to them by Audi Assist (AA). Following advice from this forum, I phoned Audi Assist who attended the car on my drive within the hour. The guy hadn’t got the part, was aware there’d been several of these issues, went away to order it. Had to be back-ordered so he made a date to come back & fix abt 10 days later. He did, so helpful, and only cost me £74!! If I’d gone to Audi dealer they wanted it for 48 hours, so imagine what that would have cost! Thanks to all here, & my advice is keep your membership of Audi Assist - I’d also extended my warranty which helped as well😉…