This is a D2 I take it? If so it's about £10 for the part and a couple of hours labour at most. If you can confirm what car I'll find the fix and post you it, it's in the common faults sticky's if you want to look yourself
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Audi D3 S8 - 2007 - V10. B&O, Phantom Black, black and silver interior, and still completely standard with everything working as it should
Audi TT - 2015 - Ultra