When I had the same problem, it turned out that one of plastic connections between motor and glass was broken(looks like plastic rod split in the middle and with round top that connects to the mirror plastic frame).

Hello all, long time lurker, first time poster. I was hunting some misfiring and high STFTproblrms on my 2.5t, which turned out to be melted tip on nr.3 spark plug(with only 3K km on it), and after afresh set of plugs things got better, but I still had fluctuations in fuel trim (it would go from 6% ...