Yes. you can program any number. put the key in the ignition push the lock button on your keyfob, pull th key out while holding down the lock button and press the unlock button 5 times. Your key is now reset and ready for use
SOURCE: have mercedes E class key fob will not open doors,
If key will not turn
Car battery flat,charge or jump to activate elec ignition
SOURCE: Mercedes Benz 2002 C Class 180. Key fob batteries
You have to seperate the front of the fob casing by sliding or prising at the side this will then reveal the batteries. You can get replacement batteries from most garages or your MB dealer (who will probably fit them as well)
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