How to install headlight bulbs on an audi a4

Written by william zane
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The Audi A4 is a popular sedan that is valued for its engineering, safety and performance. As with any car, the headlight bulbs on the Audi A4 will need to be replaced periodically. New bulbs are inexpensive and available at auto parts stores and Audi dealers. Installation is straightforward.

Skill level:

Things you need

  • Torx bit (optional)
  • New bulb

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  1. 1

    Open the front bonnet. Locate the tops of the headlights in the engine bay. Depending on the model year, you may or may not need to remove the headlight itself to access the bulb. See how much clearance there is behind the headlight. If you can reach down and pull the bulb out, there is no need to remove the headlight.

  2. 2

    Remove the two T25 screw bolts at the top of the headlight housing that hold the housing on. Use the appropriate star-shaped bit to remove these bolts.

  3. 3

    Loosen the two T25 Torx screws at the lower back part of the headlight housing. These do not need to be removed. Slide the headlight forward so you can reach the back of the housing, where the bulb is installed.

  4. 4

    Disconnect the wiring harness socket that goes to the headlight bulb by pulling it gently but firmly straight back. Squeeze the metal clips that hold the socket in place to open the clips. This should allow you to pull out the socket.

  5. 5

    Turn the headlight bulb until the tabs on it line up with the slots on the socket, then remove the bulb. Install the new bulb by sliding it into the socket and turning it.

  6. 6

    Close the metal clip over the bulb socket. Reconnect the wiring harness to the socket. If you unbolted the headlight to reach the bulbs, slide it back in place and install the top bolts. Tighten the bolts on the back of the housing. Close the bonnet. Turn the key to the on position, then turn on the headlights to make sure they're working.

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