Each tire, including the spare have a sensor. If the light is on steady, you should fill the tires to 34lbs even though the door reads 30psi. Don't forget the spare tire. If the light blinks then stays on steady, one tire is not communicating with the sensor. Now you will have to have it diagnosed to find out which sensor is not working. Pricey little fix.
Tire Pressure Warning Light
in 04 - 09 Lexus RX330 / RX350 / RX400h
Posted
Each tire, including the spare have a sensor. If the light is on steady, you should fill the tires to 34lbs even though the door reads 30psi. Don't forget the spare tire. If the light blinks then stays on steady, one tire is not communicating with the sensor. Now you will have to have it diagnosed to find out which sensor is not working. Pricey little fix.