Do it yourself
Frequently asked questions about cars and motorcycles
Car tutorial (Do it yourself) Motorcycle tutorial (Do it yourself) Frequently Asked Questions

How to Replace the Remote Key Battery of the Smart Forfour

Model: Smart Smart Fourfour1, 454 - Years: 2004, 2005, 2006
Part: Key

See other generations:
Video tutorial

In this video, see how to disassemble the key of the Smart Fortwo and Forfour to replace the exhausted battery. Start by getting a screwdriver (or another pointed object) and pry open the key casing halfway.

Once done, you can extract the battery from its slot and replace it with a new CR 2016 3V battery; it can be purchased online or at general spare parts shops. Now test if the key works correctly in all its functions.

As seen, this is a simple and quick operation.


Updated on 2 May 2026 by ScegliAuto


Related tutorials

Where to Find the Fuse Box of the 2015 Smart Forfour
Where to Find the Fuse Box of the 2015 Smart Forfour
Smart (2014-2022 / 453) To locate the fuse box of your 2015 Smart Forfour, follow these simple steps. First, reach the driver's seat and find the small compartment located a…
How to reset the service light of a Smart Forfour.
How to reset the service light of a Smart Forfour.
Smart (2004-2006 / Fourfour1, 454) Let's see in this video how to turn off the service light on a Smart Forfour: the correct method varies depending on the year of production. For the …
Removing the Front Seat of a Smart Forfour
Removing the Front Seat of a Smart Forfour
Smart (1998-2007 / 450) Today, remove the front seats from a Smart Forfour. First, open and lift the bonnet and disconnect the two battery terminals (positive and negative).…

    Frequently Asked Questions

    • Smart 1998-2007 - What to do if the key gets stuck in the Smart? Read answer

How to Reset the AdBlue Warning Light on a Peugeot Boxer

To reset the AdBlue system on a 2018 Peugeot Boxer, follow these steps: Start the engine and ensure the vehicle is parked in a well-ventilated area. Locate the "MENU" button on the dashboard or steering wheel controls. Press and hold the "MENU" button until the menu options appear on the display. Use the arrow buttons or scroll wheel to access the "Vehicle Settings" or "Settings" menu. Select the "AdBlue" or "AdBlue System" option. Look for the "Recharge" or "Reset" option in the AdBlue menu. Once you find the reset option, select it and confirm your choice when prompted. The system will be reset, and a confirmation message may appear on the display. Turn off the engine and wait a few seconds. Restart the engine and check that the AdBlue system has been reset.

Watch the video!


by ScegliAuto

More videos