It will vary depending on if you have HID lighting or Halogen Lighting which you did not include in your question. 2006 Audi S4 headlight bulb general replacement procedure: Purchase the correct replacement headlight bulb(s) first, before disassembling the vehicle. See sources and related links below for replacement bulb information. Then consult your owner's manual for the headlight bulb replacement procedure. As simple as it sounds, the owner's manual is the best place to start for bulb replacement instructions and illustrations. You may want to consider replacing both left and right at the same time in order to keep brightness and color equal (optional).
2006
Replace headlight bulb only when blown.
All you will need to change the bulb is a screwdriver and a new bulb. Remove the headlight cover using the screwdriver and remove the burnt out bulb. Once out, you can insert a new bulb into the slot and replace the headlight cover.
changing head lamp bulb on Audi q7
changing head lamp bulb on audi q7
On older vehicles you replace the entire headlight. On the newer vehicles you just replace the bulb unless the headlight assembly is damaged.
See sources and related links below.
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Are you asking how to replace the entire headlight assembly -OR- how to replace just the headlight bulb? Just the bulb.