Anyone Else's TPMS light go on for a few seconds while driving and then go off?
This happens to my 2009 RX about every once a week. Been happening for over a year. Never throws a code.
All 5 of my tires' PSI are good.

 

I have an RX330 so I don't have them so I'm not much help.
But looking at the problems other members have with them sometimes I'm kinda glad I don't have to mess with them...

 

I thought the 330's had them, too.
It's a useless "safety" feature created by Eggheads to make our wallets lighter.

 

I've had to deal w/ that & then the light would flash, I ended up buying 3 new sensors when I went w/ 255's....

 

You may have a sensor where the battery is becoming borderline. I don't know if there is any way to detect the signal strength of the sensor transmitter. I know that the tire shop detector tool "reads" the sensor RF signal, but whether the tool can determine signal strength is not known by me.

 

Have you tried airing up your spare? Sometimes if the spare is low, it will cause the light to turn on and off intermittently.

 

This X2 ^^^^