As of April 2015, to order a replacement key for a Mercedes-Benz, you must contact a Mercedes-Benz dealer. Before a dealership can issue a new key, however, it requires you to provide documentation to prove ownership.
If the person who needs a new key for a Mercedes-Benz is the owner of the vehicle, the dealer requires the current registration for the vehicle as well as proof of the owner's identity. This could be a driver's license, state-issued identification card or passport. The dealer cannot accept proof of identity that is photocopied or duplicated, however.
If the person who needs a new Mercedes-Benz key is an authorized representative of the owner, the dealership requires the current registration of the vehicle, proof of identity of the authorized representative and a signed and dated authorization from the owner.
When the owner or representative has presented all of the required documents to the Mercedes-Benz dealer, the dealer can synchronize a new key for the vehicle. The key does not work until this is done, and to synchronize the key, the dealer must have access to the vehicle.
If a person needs more information about getting a new key for a Mercedes-Benz, the company suggests contacting a local dealer or calling the company.