The low tire lite keeps coming on when the tires are fine. What else could cause on 1999 Buick Regal

The drivers side tire had recently flew off while the car was in motion. We got 2 new rims in the front as well as 2 new tires.

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1 answer
Most of the early Tire pressue systems did not actually monitor the tire pressure...they used the speed sensors for the anti-skid system by montitoring the speed signals from wheels. It may have a failing speed sensor or the replacement tires could be a different circumfrence. Check the tire sizes to make sure they are the same as well as the replacement wheels.