If you're lucky, the problem could simply be a blown fuse. Pull the cover from the fuse panel, located on the lower driver's side dash, and locate the headlight fuses (20 and 21 are the low beam fuses). Pull them out and check to see if they are blown, and if so, replace them.
1 First Name: vee Location: Hong Kong Audi Model:: A6 2.8 Audi Year: 2010 Posted April 12, 2022 (edited) I am restoring an Audi A6. Both head lights did not work. Removed them and stripped them to find all the internal cabling gutted. The HID controllers had signs of water damage.