I just purchased a 02 W210 and it came with 2 keys. Both keys start the car fine - however - one of the keys does not work to lock/unlock the car (the remote or the blade).

Is there a way to re-sync the key with the car so that the remote lock/unlock works for the second key? It seems strange that it would start the car but not unlock the doors

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Daily Driver: 02 E430 4MATIC
In the family: '03 E500 // '04 ML500 // 64 220SE