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The iHKA is the air conditioning control unit. The panel where you turn on and off the air conditioning and adjust the temperature. The I-drive screen is actually called a CID and it is a control display for all the functions such as navigation, radio, settings, climate control, services due, etc... There really is not a way to fix them without replacement. The control units are programmed to the vehicle and are usually VIN specific and cannot be used from car to car without causing other issues. I have used them temporarily to test a module but never left in or tried coding mine to another model. That makes it hard because you must replace it and that is expensive !!! You can try a used one from a junk yard but most likely will cause new issues
The tire pressure monitor must be reinitialized. There should be a tire button to press and hold or if you have idrive then it will be an option under car settings I think. Your BMW owners manual will have the exact procedure.