My NX 350h came from the dealer with the tire pressure near 40 PSI. I have been waiting for cold weather to adjust the pressure down closer to 33 PSI. It was in the low 20's this morning so I thought I would lower the pressure to 35 PSI to still have room for the temps to get even lower. So.. using a fairly accurate gauge I set all tires to 35 PSI. Then I went into the car and checked the tire pressure on the screen. They all read as dashes. Also, on the Lexus App, they read the same as before I lowered the air pressure. At this time I went online and found posts from other Lexus vehicles describing the same issue. They said you either have to drive around for several miles to warm up the tires, or in some cases wait for spring and warmer weather for the TPMS sensors to work again. Is this a thing with Lexus sensors? My 2015 Acura TLX has never had a problem with TPMS sensor readings. After changing pressure I only had to wait a few seconds for the sensors to update. Surely Toyota can do better than this. Does anyone else have these TPMS issues?

 

Look at this thread, I think it answers your question: https://www.clublexus.com/forums/sho...errerid=161523

Good Luck

YMMV,
​​​​​​​MidCow3

 

I've had many BMWs and they all required several miles/minutes of driving before the TPMS sensors would update.

 

I have a 2013 RX 450h and I've always had to drive a bit for the sensors to give a reading.

 

Quite normal in my 2017 NX after dropping tire pressure. Just drive for couple of minutes and you will see actual pressure setting.

 

In order to preserve the battery life in the sensors themselves, they "go to sleep" after a short time of not moving.

Driving around a for a minute or two will "wake" them up and then you'll get readings that are then current.

This is why when you change the air pressure, the readings don't change, until you drive a bit.

My guess is that the APP stores the last active reading, unless or until a new reading happens, triggered by vehicle movement.

 

This is the correct answer

 

Thanks everyone for the replies. After I posted this question, my wife took the car to do some errands and the tire pressure readings still hadn't changed. I then went into the tire pressure settings and there are two options. The first option "Set indicated air pressure" I believe will set readings to 33 psi. The second option "Set current air pressure" will set it to the actual tire pressure. If I manually adjust pressure in all four tires to 33 psi, then select "Set indicated air pressure", does that calibrate the TPMS sensors to register the current tire pressure as 33 psi? If I hadn't set tire pressure to 33 psi, say 35 psi, then the TPMS sensors would be calibrated to believe 35 psi was 33 psi. If I use the "Set current air pressure" after manually adjusting tire pressure, does that just set readings (possibly inaccurately) based on how accurate the TPMS sensors are?

Sorry for the confusion, just trying to understand these two different options.

 

I believe the system simply reports your tire pressure deviation from whatever you choose as the normal pressure.

So if I'm correct, when you have what you want in the tires (say 33lbs as measured outside of the system) and you choose set current tire pressure, you've just established for the system that 33lbs is normal, and it will monitor for changes from that 33lb reading.