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How to Replace the Key Battery of the Volvo S40

Model: Volvo S40 MK 2 - Years: 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
Part: Key

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Video tutorial

To correctly complete the replacement of the battery located inside the key of your second-generation Volvo S40, follow the procedure described in the following guide. First, purchase a new CR2450 battery, then take the car remote and slide out the physical emergency key from inside it. Once this simple operation is complete, use the same emergency key to remove the protective cover and proceed to replace the old exhausted battery with the new one. Finally, reassemble the remote cover, and you are done.


Posted on 1 February 2026 by ScegliAuto


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In the Opel Zafira, it may happen that the radio locks and consequently requests the appropriate security code, especially after disconnecting or replacing the battery. The code can be found in the documents provided at purchase or through one of the various online recovery services. Once obtained, enter it by following the procedure shown in this tutorial. First, switch on the instrument panel, then press and hold both the "AS" button and the left knob for about 5 seconds. Next, enter the first digit by repeatedly pressing the "1" button, continue with the next 3 buttons, and save the setting by pressing the "AS" button again.

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