Quick update. I took the car to be looked at at a local tire shop (Kal Tire) and they used their programming tool and reprogrammed the sensors in 5 minutes. Everything works as it should now and iDrive displays recommended and actual tire pressures, which change as the tires are inflated and deflated. Thanks for everyone's help. If anyone has this issue in the future, I'd recommend trying this first before going to the dealer.
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