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How to Open the Key Fob for the Mercedes A-Class - B-Class

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

In this guide, you will find the main instructions to disassemble and open the key fob for the Mercedes A-Class, as well as the B-Class. First, take your key fob and remove the physical key from inside it. Then, pry on the sides of the fob to open it into two parts, accessing the circuit board and the battery, as shown in the video. At this point, replace the battery or the shell of the key; if necessary, transfer everything to the new casing, following the video to the end!

Updated on 4 July 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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