Important
Never touch the bulb glass with your bare fingers. Grease and oils from your fingers vaporise from the heat and will leave a deposit on the reflector, which may damage it.
You need to make sure that the new bulb is of the correct type:
Rear indicator light | PY21W |
Turn the car off.

Press the top edge of the panel cover to make it pivot and remove it.
Move the insulation aside to access the support bridge.

Unscrew the spring screw by turning anticlockwise. Leave the screw in the support bridge so that you can find it when you need it again.
Press the clips into the sides and remove the support bridge.

Turn the grey bulb holder anticlockwise and pull it out.
Press the light bulb and turn it anticlockwise to remove it from the holder.
Insert the new bulb into the bulb holder and turn it clockwise.
Put the grey bulb holder back in place and turn it clockwise.
Make sure that the clips on the support bridge are positioned correctly and fasten it with the spring screw. Tighten the spring screw until it stops, max. 2 Nm (1.5 ft lbs).
Reposition the insulation.
Reattach the cover panel. Push it in to make sure it's secured.