SOURCE: My 2003 mercedes kompressor C200 key is not working!
the key's are special order and they are fairly expensive. Test the voltage in your remote batteries. They should be 3 volts. These systems are very voltage senstive and require a good battery to operate properly. I'm assuming you have the original batteries in the remote now and it is 6 plus years old. These batteries generally last 3 years so it is definatly time if you have not replaced them yet!
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