How do you reset Mercedes 2004 ml 350 key fob?

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.