It appears that the issue with starting is related to one key and not the other. Just tested it today and the one key will activate all lights and turn the ignition but when attempting to start the x5, nothing. Put the other key and she starts up like nobodies business.

So, do I need a new key or can something be done to this one?

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D2 Dave K.
2005 X5 4.8iS (Black/Black) build date 12/04
2003 330xi (Blue/Black) build date 2/03

Eastern PA USA