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How to Change the Key Fob Battery on a Mercedes A-Class W169

Model: Mercedes Classe A W169 - Years 2004-2012
Part: Key

In this short and simple guide, learn how to disassemble and replace the battery in the key fob for the Mercedes A-Class W169, as well as the B-Class W245. First, take your key fob and start by removing the physical key from inside it; then pry on the sides of the slot to remove the back cover and access the battery compartment, as shown in the video. At this point, replace the battery with a new one of the correct type (in this case, a CR 2025 3V), inserting it correctly and in the right direction, following the video to the end!

Updated on 29 April 2026 by ScegliAuto

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How to Repair the Key Spring of the Peugeot 207?

Over time, frequent use of the key's flip mechanism in the vehicle, dozens of times a day, inevitably leads to wear of the internal spring. As shown in this video, replacing the spring is quite simple and takes little time. After opening the casing halfway, first position the key, then the spring housing, and finally insert the spring into the previously mentioned housing. Close the casing by rotating it clockwise, ensuring all components fit perfectly, and test the key's flip mechanism.

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