How to Reset a Mercedes Key Fob

1. Put your key in the ignition of your Mercedes-Benz and push and hold the lock button while the key is in the ignition. Do not turn on your vehicle during this process and do not let go of the lock button.
2. Remove your car key from the ignition while you are still holding the lock button. Click the unlock button on the fob five times, still holding down the lock button.
3. Remove your finger from the lock button and your key should be reset. Test your key fob to ensure that it works.