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How to Replace the Key Battery for the Mercedes A-Class

Model: Mercedes Classe A W177 - Years 2018-2026
Part: Key

Replacing the button battery inside your Mercedes A-Class key is one of the simplest tasks you can perform on your own. Follow these steps to do it. First, locate the small metal button on the back of the cover. Press it and slide out the physical emergency key. Now, using the same key, fully open the cover, and right underneath, you will have access to the dead battery. Replace it with a new one, and finally, reassemble the cover, making sure to reinsert the emergency key.

Updated on 11 May 2026 by ScegliAuto

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While driving, if you notice the tyre pressure warning light coming on, first check the actual inflation pressure of the tyres and, if necessary, restore the pressures recommended by the manufacturer. After restoring the correct pressures, you need to reset the warning light that has illuminated on the instrument cluster. To do this, locate the reset button on the lower central console. Press this button and hold it down for at least 3 seconds, after which the low pressure indication will turn off.

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