How do I replace the Drivers side fog lamp (not just bulb) on my 2002 Audi A4 18T?

If it is a double filament bulb, try to rotate by 180 degrees in base, since there is a difference in power and touch of the bottom pins

No. The best way to service the H11 bulb, day time running lamp, is from under the vehicle. To do this you will need to remove one or more of the plastic screws that retain the skid plate. With the skid plate lowered or removed access to the bulb should be simple. Good luck.

First remove the driver's side fog lamp plastic cover out from front bumper. After that you will find torx socket head panel screws from fog lamp. See picture below:

1. Remove the plastic grill cover out from front bumper.
2. Remove the front fog lamp & replace the bulb.
See pictures below:

SYLVANIA H7 SILVERSTAR HIGH PERFORMANCE HALOGEN HEADLIGHT BULB -- 55 Watts, Single C-8 filament for use as either high beam or low beam; 100 percent legal halogen headlight bulbs; Features the whitest and brightest light colour similar to daylight for safer night driving; Meets all US FMVSS 108 and Canadian CMVSS 108 requirements. Fits Driver or Passenger Side Driver or Passenger Side Fits the following vehicle/s
2004 Audi S4 Base 8 Cyl 4.2L 2004: Base; 8 Cyl 4.2L RAMPAGE FOG LIGHT, BLACK METAL HOUSING, With round clear lens; Includes 100-Watt H3 halogen bulb, one lamp and a single bolt mounting system; Provides better illumination Fog Light

• 
  Fits the following vehicle/s: 2004 Audi S4 Base 8 Cyl 4.2L 2004: Base; 8 Cyl 4.2L;

Well, these are the steps and I will post the pic here in a second...looks like 2 screws...but like I said, you can see the picture for direction on this.


Remove or disconnect the following:

Front turn signal lamp

Connector

2 screws

2 claw fittings

Fog lamp assembly

Fog lamp bulb as shown

Fog light unit

To Install

1. Install or connect the following:
   • Fog light unit
   • Fog lamp bulb as shown
   • Fog lamp assembly latch the 2 claw fittings and 2 screws
   • Connector
   • Front turn signal lamp

Trying to post the pics now....

there are a couple of screws in the front of the fog light that will remove the lense so you can replace the bulb.

That's the rear foglight socket. The rear foglight idea is European, and they ship the Audi over with a rear foglight as well, but it's only on the driver's side (that's the way rear fogs are done in Europe). That socket is fully powered though, and wired to the same dash switch as the driver's side rear fog. What you can do (what I did on my 99 A4) was to use a drill and **** out the rectangular opening in the rear taillight panel, and then put a bulb in that socket. Voila, instant dual rear fogs.

This is a good idea because in Europe, the police understand that a rear fog is only on one side. In the US, our police don't always know that, and you may get pulled over if you have that on - they may think you have a blown taillight bulb. Do the dual fog mod as described above - it'll save you the hassle and it looks better too.

Yes, you can replace just the bulb. A local auto parts store may be able tell you which bulb you need or you'll have to pull the bulb out and take it in.

I just replaced the fog light bulb on my 2008 Azera. I went under the car and removed two screws from the protective shield. I pulled down the shield and reached up and turned the fog light socket and pulled it out of the housing, remembering which side the wires were on and removed the old bulb (Don't touch the new bulb with your hand) and replaced it with the new bulb. The job took less then 15 minutes