For light money, you could
1. look at the wiring to the sensors at the wheels (I had a '90 744 TI that had wide wheels and one of the wires to the front wheels had a rub spot on it - I was able to move the wire through its mounting to bring it away from the wheel
2. Check the rings that the sensors use - they can get gunked up or deteriorated so that they do not work correctly.
3. Reset the computer in your car by disconnecting the battery for 10 minutes or so. I had a problem that caused my 2008 XC 70 to lock me out because I did not correct a low tire pressure. I had to use my emergency key to get into the car. My dealer, Volvo of North America, and this board had never heard of this problem. My son-in-law's father suggested that I disconnect the battery - issue cured!
My son-in law suggested that the wireless computer in Subarus ran both the tire sensors and the remote key!
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