Does the warning light always indicate that tire pressure is low?
The warning light may indicate a system malfunction requiring a Lexus Dealer’s attention. If it flashes before staying on continuously, the tire pressure could be within the appropriate range, but you should contact your Lexus Dealer for a system inspection.
If a tire consistently needs to be filled with air, have it checked by your Lexus Dealer. For vehicles equipped with the Tire Pressure Monitoring System, Lexus recommends the installation of a Tire Pressure Monitoring System (TPMS) on winter wheels.