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How to Replace the Key Battery in a Mercedes A-Class

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

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If pressing the buttons on the key fob does not unlock the doors, it is likely that the key battery is dead. Replacing it is very simple: first, pull out the mechanical key from the back of the fob and use it to pry open the designated slot to detach and remove the back cover of the key fob. Once this cover is removed, you can easily access the battery compartment and replace the battery with a new one, ensuring that you orient the battery correctly and use the same model.


Updated on 22 February 2026 by ScegliAuto


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How to Reset the Tire Pressure Light on a MG ZS?

On the instrument cluster of the MG ZS, the tire pressure light that appears can be reset by inflating the tires to the correct pressure: this value will be indicated on the sticker attached to the driver's door pillar. Once the tires have been properly inflated, you can turn on the instrument cluster and navigate through the menu until you find the option that indicates tire pressure: if this screen shows the new values, the light will turn off; otherwise, you will need to drive for a few miles so that the sensors can read the new values and turn off the light afterward.

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