BMW Questions? Ask a BMW Repair Expert for Answers.
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the problem is most likely that the control module (control computer) for Bluetooth is faulty. this is a very common problem and would require it be replaced.
you can try unhooking the car battery for an hour as this will reboot all systems and can sometimes clear out a glitch like this, but unfortunately you will likely need a replacement module.
the module will need to be replaced at a dealer or a well equipped BMW specialist as it requires special programming after replacement.
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