The key fobs are not user programable. I have heard there are some locksmiths that can program the keys but I live is Texas and so far have found none to program any for my car. The only solution is to pay Mercedes to order a key from the Mercedes headquarters. If you choose this route make sure you have your title or registration along with the drivers license or they will not be able to order the key for u.
Most (if not all) key fobs can be recoded. You may want to inquire with your dealership or a good locksmith.
You need a gm scanner to program a factory gm remote fobs.
Try this site: http://ebiz.netopia.com/pyr/door/.
Making Key Fobs
Need an advanced Scan Tool to perform this Necessary to take it to the dealer .
amelia is the hottest fobs
To reprogram the key fob for a 2002 Mercedes, first, ensure you have all the keys you want to program. Insert the key into the ignition and turn it to the "On" position without starting the engine. Press and hold the "Lock" button on the key fob for about 5 seconds, then release it. Turn the ignition off and remove the key; the fob should now be reprogrammed. If you have multiple fobs, repeat the process for each one.
As far as I know only the dealer can do this for you. When you bring the car to the dealer have all keys and keyless entry fobs with you as they all have to be recoded.
To reprogram the key fobs for a 2005 Jaguar XJR, first, ensure you have all the key fobs you wish to program. Insert the key into the ignition and turn it to the "On" position without starting the engine. Within five seconds, press and hold the lock button on the key fob for about 10 seconds, then release it. Repeat this process for any additional fobs, turning the ignition off to complete the programming.
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I'm pretty sure the dealership has to program the fobs. I programmed my key using the instructions in the owner's manual. They're really simple if you follow them step-by-step, but I'm not sure if the instructions for the fob are in there.