Search locally to see if you can find a vendor that can check the key's battery voltage....that will reveal if the battery inside the key is dead ornot.

You still need a 2nd key...which doesn't have to be a remote key...there are non remote keys you can purchase from BMW that cost a lot less money

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• 2015 f06 650ix GC (Moonstone exterior/Cohiba brown Merino Leather interior)
• 2014 f15 X5 50i (Space Gray exterior/Mocha Nappa Leather interior)