There is no battery in the key fob just take it to the dealer with all the keys u have from the x and they reset them togther...
You do not have to reset the key fob when changing the battery.
how do i reset key fob for a vw golf 2001 how do i reset key fob for a vw golf 2001
By driving with the key fob in the ignition.
To reset the key fob on a Renault Megane (1997 and onwards), 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 remote for about 10 seconds. Then, turn the ignition off and remove the key. Test the key fob by pressing the buttons to ensure it is functioning correctly.
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To reset a Movano key fob, start by inserting the key into the ignition and turning it to the "On" position without starting the engine. Press and hold the "lock" button on the key fob for about 10 seconds, then release it. Finally, turn the ignition off and remove the key. This should reset the key fob, allowing it to resynchronize with your vehicle.
The key fob doesn't get reset... the keyless entry module gets programmed to accept commands from that key fob. If your key fob suddenly stops working and it's not a battery issue, then you either have a problem with your key fob itself, or the keyless entry module, and it'll need to be diagnosed and repaired accordingly.
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.
nothing works and I replaced the battery. to the fob