Generally it means you need new bulbs, specially if they are HID ones. At least on my Treg, that is the caseI have this flickering headlight issue as well... 2004 v6 touareg. It seems like no one had a for sure fix. Im thinking about a new bulb but don't want to deal with it flickering again down the road... just checking again since this is an old thread. Will a new headlight w ballast fix this or is it the harness or something else. ?? Thanks.