C320, V6, Sport coupe headlights (Low beam) w/ H7 halogen bulbs:
Tools needed: Torx screwdriver, replacement bulbs, rubbing alcohol (if needed)
1. Locate Low beam lights. Should be the larger of the two headlight covers (or check your manual to confirm);
2. Twist off cap;
3. Unscrew the 2 screws holding in the headlight bulb; located to the left and right of the bulb.
4. Pull bulb from socket. Bulbs are 2-pronged w/ a metal base. grip the base and slowly budge the bulb from the socket.
5. Replace w/ new bulb, grip the metal base and securely push into the socket. DO NOT TOUCH the halogen bulb w/ your fingers. IF you do, wipe the bulb w/ rubbing alcohol . Oils transferred by human contact will reduce the lifespan of the bub.
6. Return bulb to headlight and replace screws.
Either from a Mercedes dealer, who can order one for you . Or from a breaker's yard, dealing in European cars.
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Note, there is no E 320 but there is a C320 in 2005. It will vary depending on if you have HID lighting or Halogen Lighting which you did not include in your question. 2005 Mercedes-Benz C320 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 lamp 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).
how to replace the headlight
On older vehicles you replace the entire headlight. On the newer vehicles you just replace the bulb unless the headlight assembly is damaged.
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