How to open key? - MBWorld.org Forums

Feb 15, 2026 | 07:52 AM

Ron3945

Thread Starter

Newbie

Joined: Feb 2026

Posts: 1

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W212

How to open key?

Hi,

My key will not always work. When pressing very strongly on the open button it works. Probably a small issue with the button. How can I open the key?

Thanks,

Feb 15, 2026 | 04:18 PM

Sunnyslope48

Senior Member

Joined: Apr 2016

Posts: 451

Likes: 148

From: Phoenix, AZ

2016 E350 Sport 2WD

Are you asking how to remove the side panel so that you could replace the battery? or something else? Please clarify

Feb 16, 2026 | 10:05 AM

Arrie

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Joined: Oct 2010

Posts: 5,121

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From: Southern US

2010 E550, 273 Engine: 2012 S550, 278 Engine

Quote:

Originally Posted by Sunnyslope48

Are you asking how to remove the side panel so that you could replace the battery? or something else? Please clarify

He is asking how to take the key apart to get to the buttons inside as he thinks he has a button problem.

Feb 17, 2026 | 10:34 PM

JCM_MB

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Joined: May 2021

Posts: 2,516

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From: US

2008 E350, 2012 ML350, 2014 E350, 2015 ML350

Super Marios

Feb 19, 2026 | 02:49 PM

MacVidMB-V8

Super Member

Joined: Oct 2012

Posts: 537

Likes: 88

From: Hollywood, CA

W209, W124

If you have a single battery key with triangular panic button, getting to the PCB can require destroying the key body as they are thermally glued together.

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