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tire pressure indicator is 'on'

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when i start my es350 2010 (29k miles) the tire pressure indicator is flashing about 20 times and then turns solid. checked all my tires including spare. the pressure is fine.

what could be the problem?. any help would be   highly appreciated

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I assume you pressed the TPMS reset button.  One of the sensor batteries could be dead.  They sometimes start failing at 8 to 10 years.  A tire shop should be able to read diagnose the problem including reading the strength of all the batteries with a handheld tool that they hold next to the wheels.  The batteries are not replaceable which means buying new sensors.  If one of the sensor batteries is dead, you might as well replace all the sensors.

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