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

Model: Mercedes Classe A W177 - Years: 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025, 2026
Part: Key

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Video tutorial

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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    Frequently Asked Questions

    • Classe A 2012-2018 - Why is my Mercedes A-Class W176 key not recognized? Read answer

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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by ScegliAuto

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