I thought I would start a thread with all your A3 faults, i'll start with mine! Car is a 56 plate tdi sportback. New Gear box Shuddering when accelerating Windows go down on their own! The shuddering one is the most annoying as Audi can't trace the fault. If there computer doesn't throw up a fault code then they can't do anything about it. I can't believe a 20k car can be this bad. From reading other posts it seems i'm not alone in faults!