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Q:

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

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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.
(1) Answer
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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.