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I replaced all four sensors two years ago with new units. They work fine until I hit 90...then the right front sensor dies and I get the service tire mon sys message.
Stop. Sit for a second start rolling the sensor comes back normal. 90mph, sensor dies.....repeat....
Wow, Canada has 90 MPH speed limits? Makes me want to move north. Ok, enough kidding around. The only thing I can figure is the centrifigal force placed on the sensor at that speed must be pulling a cold solder joint loose enough to break the signal. I would say either replace the sensor or slow down, not much else you can do. Good luck.