I have had my 2000 2.7t for 2 months and every 3 weeks my drivers side headlight burns out (none of them burned out instantly they all lasted about 3 weeks). I am on my 4th headlight since I bought the car. Any ideas on what the problem is???

For now I am content with just changing the bulb for fear of it being some major electrical undertaking.

 

I suspect the headlight you are talking about is halogen and your low beam. Am I correct?
Since you are not blowing fuses, at least you have not indicated that, I would rule out a short.
The next thing I would troubleshot is the groud wires.
What I think is happening is that your light may be flickering because of faulty wiring or loose connection, and that is the fastest way to a burn-out.
You should try driving the car with a buddy driving ahead of you who could observe your headlights while the car is in motion on the road.
Since only the driver side burns out, your buddy may see a difference between both lights. If nothing is different then let's move on to the next step. You should have access to a volt-meter (cheap at the Rat Shack) and measure the voltage at both headlights and compare the 2. I strongly suspect you will see a difference. Then you will have to trace the wiring back to the source, checking every connection. The best thing you can do is to disconnect every connector you encounter and check for rust or "green" stuff. Clean with some agent (also available at the Rat Shack) and reconnect. I am not sure if the A6 has a separate relay for each headlight; that could also be the culprit, and cheap to replace.
Hopefully this will solve the isue. If not you can also check the lights switch, remove and test with an ohm-meter.

 

Thanks for the reply.

Yeah it is the low beam halogen and the fuses are fine. We do have a volt-meter laying around here somewhere. I'll check out in the next couple days if it flickers on the road or if there is a difference in voltage between the two.