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How to Change the Key Fob Battery of a 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

This short video guide shows the steps necessary to replace the battery in the remote of a fourth-generation Mercedes A-Class. Start by removing the metal emergency key by pressing the release button located on the back of the remote.

Then, use the removed key to help detach the back cover of the remote. After that, remove the battery cover as shown in the video, and finally, take out the old battery and install a new one, then close everything up. The required battery is a CR2032 3V.


Updated on 1 July 2026 by ScegliAuto


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by ScegliAuto

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