2017 A4 Ultra...25000miles ....having not long been stung for a £1000 bill to replace the adblue management unit, now the servo brake sensor is lighting up our lives. Have read the posts on here, have ordered a replacement off ebay. Have gone for the cheap £19.99 one. If it works, then car is getting sold. Audi customer service are worse than hopeless....in fact, not much better than their cars these days 🙄