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How to Replace the Key Fob Battery of a Mercedes C-Class

Model: Mercedes Classe C W203 - Years: 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
Part: Key

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Video tutorial

In this video, we will see how to replace the key fob battery of a Mercedes C-Class. Take your key fob and slide the button to release the metal key. Once the key is out, use it to press in the key fob until the top plastic cap pops off. Remove the worn battery with a screwdriver, take a new one of the same size and voltage.

Reassemble the cover on your key fob by pressing until you hear the locking click. Finally, insert the metal key back into the fob. Check that the key fob works correctly.


Updated on 27 February 2026 by ScegliAuto


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by ScegliAuto

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