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How to Replace the Key Battery in 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

The key is undoubtedly one of the most used components of your car, and periodically, it is necessary to replace the battery inside. Fortunately, the cost of this operation is very low, and it can be done in just a few minutes by following these steps.

Press the button located on the back of the cover and remove the key. Hold the same button and slide off the back cover. The battery holder is located on the left side; locate it and remove it using a flathead screwdriver.

Now you can take out the old battery and replace it with a new, fully functional one. Insert the holder back into its original position and then do the same with the back cover.


Updated on 4 May 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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by ScegliAuto

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