Bulbs with a bayonet fastenerBulbs with a bayonet fastener  - Bulbs - Fuses and bulbs - Self-help - Audi A4 Owner's Manual - Audi A4

Bulbs with a bayonet fastener must be changed as follows:

Removing the bulb

Ц Lightly press the defective bulb into the bulb holder, then turn it anti-clockwise and remove it.
Ц Do not touch the glass part of the new bulb with your bare hands, use a cloth or paper towel instead.

Fitting the bulb

Ц Fit the new bulb, pressing it into the bulb holder, and turn it clockwise as far as it will go.
Ц If necessary, use a cloth to remove any fingerprints from the glass part of the bulb.