My GFs car, first it was intermittent, VAGGed it, no faults. Then it finally got stuck in first, VAGGED it , "Brake light Switch" WTx?? So I read a few posts, bought switch (AUDI dealer parts $11.85), assembled per vortex FAQ, now fixed.
BTW it shifted fine in TIP mode. I had bought a filter/gasket and was ready to do a fluid change, wasted 85$, but did not get dirty with a 10 min switch change.