Mercedes Repair Questions? Ask a Mechanic for Answers ASAP
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Try holding the lock and unlock on the key fobs standing next to the vehicle for up to 15 seconds and see if they re synch to the vehicle.If this does not work try locking and unlocking the door with the metal key blade or inserting the key into the ignition for several minutes with the key on or off and see if they start to work then.In some cases this will re learn them to the vehicle.If this does not work let me know.
If this is more then one key acting up like this here try leaving the key in the ignition itself for up to 15 minutes and see if then it works to rotate in the ignition as well as lock and unlock the vehicle.If this is only one fob acting up or if this does not work here let me know,
Is the battery a good battery that was installed and do any electronics work in the vehicle at all?