Do it yourself
Frequently asked questions about cars and motorcycles
Car tutorial (Do it yourself) Motorcycle tutorial (Do it yourself) Frequently Asked Questions

Replacing Battery and Key Shell for Mercedes W 203

Model: Mercedes Classe C W203 - Years 2000-2007
Part: Key

To replace the battery, first remove the metal portion of the key from the remote by activating the release lever next to it. Once removed, use a small screwdriver or similar tool to detach the chrome elements of the shell and disassemble the plastic cover. Carefully extract the battery and the electronic board by removing it from its mounting pins, taking care not to damage the electronic component. Once extracted, proceed to reassemble everything by reversing the steps taken earlier. After reassembling the remote, you can insert the metal key, and the job is complete.

Updated on 20 March 2026 by ScegliAuto

Video tutorial

Related tutorials

How to Replace the Key Fob Shell
How to Replace the Key Fob Shell
Mercedes Classe C (2000-2007 / W203) If you need to replace the key fob shell for any reason, follow this video to understand how to do it. First, obtain a new replacement shell. Start b…
Replacing the Key Fob Shell
Replacing the Key Fob Shell
Mercedes Classe C (1993-2000 / W202) This is a common issue that seems complex to fix, but in this tutorial, you will see how easy it is to repair your key fob in no time without going t…
Disassembly of the remote control and replacement of the battery for the Mercedes C-Class.
Disassembly of the remote control and replacement of the battery for the Mercedes C-Class.
Mercedes Classe C (2000-2007 / W203) Today's guide will show us how to disassemble the remote control and replace the battery of the Mercedes C-Class key. First, we take our remote contr…

Other guides you may be interested in

How to Open a Stuck Boot on the Peugeot 407?

On the Peugeot 407, the boot may become stuck, possibly due to a problem with the control button or the lock actuator. In such cases, you can perform an emergency opening by following the simple procedure shown in this tutorial. First, open the rear doors, then lower the seat back by operating the release lever. Next, go inside the boot, locate the lock, and manually operate it using a flathead screwdriver. The boot will then be free to open.

Watch the video!


by ScegliAuto

More videos