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Follow the process in this video to retrieve any error codes, then reset the codes, and then drive for a while and check again to see if any codes come back.
Sometimes you will find that weird AC issues just clear up after you do the reset:
Looks like pretty basic part to switch out. Can anyone point me to where the sensor is located?
Before you try to swap the sensor, do the reset and drive for a day or two to see if the error comes back or if it starts working again. Sometimes a reset fixes the weirdest toyota/lexus HVAC issues.
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Slideshow: A five-car lineup spanning more than five decades of Toyota performance and engineering will tackle one of Italy's most celebrated automotive routes.