My X5 came with only one key. My Indy got me another remote key from the dealer. Cost me $200. But it then had to be coded to the vehicle, (he used his Autologic). Then the keys, (both in the same process), must be initialized.

Also, I also had him sync each key to a memory seat/mirror setting.

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2014 BMW 328i Xdrive
2011 BMW 335i M-Sport
2008 BMW X5 4.8i Sport
2000 BMW 528i 5sp