How to reset mercedes key fob

1. Check the battery.
   Remove the emergency key and open the key-fob cover. Replace the battery with the correct type shown inside the key fob or in the owner’s manual.
2. Check the battery position.
   Make sure the positive and negative sides of the battery are installed correctly. Close the key-fob cover securely.
3. Reactivate the key.
   Press any button on the key fob. On many Mercedes-Benz SmartKeys, this reactivates the key after its functions have been switched off.
4. Test the remote.
   Stand close to the vehicle and press the Lock and Unlock buttons. Wait a few seconds between each attempt.
5. Start the vehicle.
   If the vehicle does not detect the key, place the key in the designated key-detection area, usually inside the center console or near the start button, and try starting the vehicle again.
6. Try the spare key.
   If the spare key works, the original key fob may have a battery, internal circuit, or programming problem.
7. Get professional assistance.
   If the key still does not work, contact an authorized Mercedes-Benz service center or a qualified automotive locksmith. Replacement keys and immobilizer programming normally require specialist equipment.

Important: Do not use an online reset sequence unless it is confirmed for your exact Mercedes-Benz model and year.