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How to Change the Key Fob Battery on the Mercedes A-Class W169 - C-Class W204

Model: Mercedes Classe A W169 - Years: 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
Part: Key

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Video tutorial

In this guide, you will learn how to disassemble and replace the battery in the key fob for the Mercedes A-Class W169, as well as the B-Class W246 and C-Class W204. First, take your key fob and remove the physical key from it. Next, remove the back cover by prying it off from the sides to access the battery.

At this point, take out the old battery and replace it with a new one of the correct type (in this case, a CR 2025, 3V); simply insert it in the correct orientation and reassemble the key fob!


Updated on 26 April 2026 by ScegliAuto


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As the video clearly shows, disabling or activating the traction control (TRC or ESP) on the Toyota Yaris is very simple. By default, the traction system activates every time the vehicle is started. To disable it, simply press the button depicting a skidding car located in the centre of the vehicle where the controls are, such as the hazard lights and the radio, but near the handbrake. Once disabled, the TRC off light will illuminate on the dashboard. To reactivate it, just press the same button again.

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by ScegliAuto

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