How to Program a Mercedes Key

1. Call your dealership and make them aware that you need a spare key. Be prepared for the price to be very high--as of 2010 perhaps $150 to $200. The keys must be ordered from the manufacturer and, unlike almost every other brand of car, must be programmed by the manufacturer to work. The dealership will advise you on what type of paperwork they require you to bring in order to obtain your key.
2. Bring your paperwork into the dealership. Generally Mercedes requires that you bring in the car's documentation and proof of purchase plus a photo ID. You will pay for the key when you place the order. After verifying your ownership, the dealer will order your key. Generally it will take two to three weeks for the key to arrive. Some dealerships will require you to leave your car at their location while the key is on order.
3. Pick up your key when it arrives at the dealership. You will be required to show your identification at this point as well. Since you will have paid for the key upon ordering, you should not be required to pay any additional fees.