MB Medic Mercedes-Benz Repair Guides, Service, How To DIY
To change the low beam light bulb on your Mercedes-Benz C-Class W204 model years 2008-2015, you will need a replacement light bulb. This guide will also help owners of Mercedes-Benz C300, C350, and C63. This only applies to models with halogen bulbs, not to those with HID D2S headlights.
You will need the following parts:
It is recommended that you replace both bulbs at the same time. That way, the light color from both lights will match, and you won’t have to replace the other bulbs a few months later.
Step 1 – Open the hood
Step 2 – Remove the plastic cap from the back of the headlight. Twist it counterclockwise to remove it. 
Step 3 – Twist and remove the old light bulb.
Step 4 – Disconnect the electrical connector from the old bulb. 
Step 5 – Install the new light bulb. Avoid touching the glass part of the light bulb with your fingers.
Step 6 – Ensure that the light bulb is secure. Reinstall the electrical connector and the cap.
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Related Questions
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You do not need to disconnect the connector. I simply used the flat head screwdriver to lift out the bulb and replace with a new one