How do you fix Mercedes remote?

To fix a Mercedes remote, first, replace the battery by opening the key fob and swapping out the old battery with a new one of the same type, typically a CR2025 or CR2032. If the remote still doesn't work, try reprogramming it by inserting the key into the ignition and turning it to the "on" position multiple times. If issues persist, check for physical damage or consult a dealership for further assistance.