One problem related to headlight switch has been reported for the 2001 Audi TT. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2001 Audi TT based on all problems reported for the 2001 TT.
Headlights just stopped working again for the umpteenth time. Park light and high beams work fine. This is a reoccurring problem with the low beams. Can be driving along fine and cut car off and start back up and low beams just won't come on. If it was 1 at a time I could see it as being no problem but they both stop working at the same time. Keep replacing switch and headlights. . . Thinking this would alleviate problem to no avail. See this is an ongoing problem with Audi owners. Also see that it's a recall on the newer models but not the late models.