I took my A4 in because the turn signals quit working. The techs told me it was a bad stalk, yet the cruise control, lights, and brights still worked. They wanted $550 to fix it.
So I go online and do some research, turns out there's a module behind the hazards button in the center of the dash that sometimes needs the contacts cleaned and distance adjusted. I pulled it out, cleaned the contacts on the turn signal, and increased the distance between the contacts, popped it back in, and now it works just fine.
Total labor 15 minutes, parts $0.
But techs know everything right?
The repair video I followed.