2004 A4 Tail Light replacement.
If you are still looking for the resolution, it's really pretty simple. It is highly recommended that you remove one light assembly at a time, thus allowing you to have a good guide when repositioning the assembly back on the vehicle body. Yes, the only way to get to the burned out bulb in the taillight is to remove the whole darn thing! The bulb burns out every 4-5 months, so I have become good at it...Here goes:
1. Open trunk. Look for small (3" diameter) cutouts in the fabric panel in the trunk liner. They are identical and appear next to the taillight assemblies, on the side, not behind the taillight.
2. Gently use a flat blade screwdriver and pry them open. These cutouts are attached to the inner trunk liner fabric, so be gentle.
3. Notice the phillips head screw inside the opening. Unscrew it slowly, making sure it doesn't drop between the chassis and the trunk liner. Remove the screw.
4. Place soft towel on the outside of the car under the taillight assembly, to prevent scratching the car bumper.
5. Gently grab both sides of the taillight assembly from the outside and pull away from the car (rear direction. Be careful not to pull too hard, or the wiring harness behind the assembly may break.
6. You can now access all lamp in the taillight assembly. Change the bulbs as needed. Also, if you can vacuum or clean the dirt on the chassis as well as on the back side of the taillight assembly, you'll feel better later :-)
7. Placing the taillight assembly back in its place is a bit tricky. It seems to go back easily, but the rubber lining nearest to the trunk opening and where the phillips head screw is, must be placed exactly right or water will leak behind the assembly.
8. Screw in the phillips head screw, but don't overtighten it. You will need to open it every 4-5 months to replace another bulb (its an Audi-VW plan to sell more bulbs).
9. Snap the trunk liner caps back in place and voila, you have done it.
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