Hi,it seems that you just would need to reinitialize the key.
Check this out...
the procedure is there
http://www.xoutpost.com/bmw-sav-foru...l-locking.html

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e53 '00 4.4i Oxford Green II Freshly rebuilt tranny(2nd one) and transfer case/front shaft
e70 '08 3.0si Sapphire Black cinnamon leather 7 seats
e61 '06 530XI Sports Touring Silver - SOLD