Either the battery inside the fob key is flat.If it works the door locks etc then it is not the fob key battery, If your key/s have been dropped it could be a broken wire on the solenoid inside if so carefully disassemble the fob key and gently remove the circuit board solder the wire back down re-assemble the fob key & try that if this doesn't work or it is not the case then contact the dealer for further assistance.
Reset your Mercedes-Benz key by placing the key in the ignition of your vehicle while the vehicle is turned off. Do not turn on the vehicle. Press a finger on the "lock" button of your key fob while the key is in the Mercedes' ignition.
Pull the key out of the ignition while continuing to hold the "lock" button down. Continue to hold the "lock" button for the duration of the key resetting process
Use another finger to push down on the "unlock" button five consecutive times. Keep holding down the "lock" button.
Release the "lock" button. This is the end of the resetting process for your Mercedes-Benz. Use your key fob to ensure it is properly working
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