If you don't have the pass key on the paperwork, you can look at the sticker on the module. It's in the driver's side cubby where the cd changer is. And you might need to remove some of the interior panels to read it. But it's easy to do and takes maybe 15 minutes and a socket.

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2006 X5 4.4i
Sport package, summer package, cold weather package, DSP + Nav
Bought 2/14 with 73k miles