Need more information, what vehicle? Newer key FOBs, for the R171 SLK have to be ordered. The dealer doesn't program and they run an average of $175. Update your profile with location and vehicle.
If it works like the Crossfires (Mercedes based early SLK) then just put the key in the ignition -- turn to on position and press the door lock buttons a few times -- leave key in the on position for 30 seconds -- turn off -- pull key and try the door locks to see if it programed. New key if bought from the dealer for your specific car should be
pre-programed for starting and this exercise is just for the door locks.
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