Not sure what fob is! But for the key, you need to approach the Mercedes Benz dealership. For the C240, 2002 model, I had to pay around $250 for a new key. It can open and close the door from around a block, so take care that you don't accidently open your car while handling your keys!
how to reset remote key fob for Mercedes SL 320
C200 key fob problem
No
Put the key in the ignition and turn the key 2 clicks to the On position and press and release the lock button on the fob. Then press and hold the unlock button on the fob 5 times and then release. This will reset the fob for your Mercedes.
Weak battery in fob?
To replace the battery on a Mercedes ml 350 key fob it is probably best to ask the supplier where it is purchased or there may be some instructions online.
check the battery in the car and the batteries for the fob key
To reset your Mercedes CE0682 key fob, first, insert the key into the ignition and turn it to the "On" position without starting the engine. Then, press and hold the "Lock" button on the key fob for about 10 seconds. Release the button, and turn the ignition back to the "Off" position. This process should reset the key fob, allowing it to sync with your vehicle.
To reset a 2006 Mercedes C-Class key fob, first, insert the key into the ignition and turn it to the “On” position without starting the engine. Press the “Unlock” button on the key fob for about 5 seconds, then release it. Turn the key back to the “Off” position, remove it, and then test the key fob to see if it functions properly. If it still doesn't work, you may need to replace the battery or reprogram the fob.
get a new one :I lol
To reset the key fob for a 2004 Mercedes ML 350, first, insert the key into the ignition and turn it to the "On" position without starting the engine. Press and hold the "Lock" button on the key fob for about 5 seconds. Then, turn the ignition off and remove the key. This should reset the key fob, allowing it to function properly again. If issues persist, consider replacing the battery or consulting a dealer.
Take the metal key out of the fob and use it to press the button inside the key fob. That should release both side and enable you to open the key fob to change the batteries