MFO

The right headlight in my '02 A4 went out. I bought a replacement bulb but can't figure out how to replace it. Help!

Jimax

it's not that difficult, it's like three screws. I've taken them out a number of times. You'll have to remove the part of the air intake that takes air from the grill to the airbox, but that's got two screws at the front and snaps into place at the airbox.

It's not difficult, just look at it to figure out how to remove the assembly. Be sure you unplug everything before you remove the assembly as the cables are too short.

IchBinEinDonut

Two screws to remove the air intake duct from the radiator support, then remove both air intake ducts, after those two screws the rest of the pieces snap out.
FOUR screws to remove the headlight housing:two on top that you can easily see, one on the right side (looking in toward the engine) and one in the back left, under the access port to the low beam. Once the headlight assembly is out, if you are careful you will not have to remove the wiring to access the low beam port, maybe you will have to undo the tie wrap if you are accessing the hi-beams, not sure about hi-beams I only did lo-beams.
This did not mess up my headlight alignment.
Easy enough to do w/o bently, certainly. And relative to other things on audis, this is a really intitive procedure.