RX - 3rd Gen (2010-2015) Discussion topics related to the 2010 - 2015 RX350 and RX450H models

TPMS how many psi does it have to drop?

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Old 12-30-13, 09:14 AM
  #16  
armadillo
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Originally Posted by ISFWes
So on the 3rd Generation RX there is no longer a sensor in the spare. That makes it worse.

I only checked the tire pressure in my old spare when the TPMS light came on. Now you will need to remember to check it at regular intervals. Or when you do get a flat you may have a flat spare tire as well.

armadillo

" I am awaiting delivery of my first Lexus RX 450h and am not familiar with the TPSM. Is there any way to check tire pressure? Or will the pressure only ever be shown when the warning comes up? "

You have never used a tire pressure gauge?
Good one. I've never had a car that has remote TPSM. So I have always checked with a gauge. What I was referring to was the image posted, which shows the 4 tire pressures. My question was whether that screen can be invoked by the driver to see the pressures of all 4 tires (as in the image) at any time. Or does this screen only ever shows up when the tire pressure of at least one tire is way too low?
Old 12-30-13, 10:01 AM
  #17  
kitlz
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armadillo, the picture I posted is a screen I brought up by using the toggle switch on the steering wheel. Normally only the tire pressure displays. So yes, you can see it at any time. The TPMS or low pressure light is separate.

One thing I meant to add, the display can take up to two minutes to read the tire pressure initially. Even more reason to leave the power on after doing a TPMS reset for a few minutes per the instructions.
Old 12-30-13, 10:30 AM
  #18  
armadillo
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So then I don't understand what the fuss is. Obviously, it would be easy enough to check tire pressure (make it habit during each refuel) and you won't be surprised. In case of unexpected deflating, the warning comes up. My tire pressure gauge won't get much use in the future I presume.
Old 12-30-13, 11:20 AM
  #19  
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Originally Posted by armadillo
So then I don't understand what the fuss is. Obviously, it would be easy enough to check tire pressure (make it habit during each refuel) and you won't be surprised. In case of unexpected deflating, the warning comes up. My tire pressure gauge won't get much use in the future I presume.
Because only the 450h has the tire pressure display in the cabin, the 350 does not. Yes, TPMS should only be used for any sudden drop in pressure. It is not a substitute for checking the tires on a routine basis, at least once a month. I still use a tire gauge and visually inspect the tires when I wash my RXh in addition to the display. Fortunately the Pirellis I put on almost two years ago maintain their pressure much better than the Dunlops they replaced.
Old 12-30-13, 12:43 PM
  #20  
armadillo
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Oh, I didn't know it was a 450h feature only. Glad I am awaiting delivery of the 450h then
Old 01-02-14, 07:46 AM
  #21  
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I completely agree that TPMS is a joke. If I had an option not to pay $300-$500 (est) premium it tacks on to the cost of the vehicle, I certainly would not. In fact, my RX spends the winter season w/o TMPS as it is rolling on winter tires. Now, that's a real safety item.
We all forget why TMPS was mandated in the first place. It has to do with Ford Explorers rolling over and killing people when running recommended 24PSI tire pressure on Firestone tires. The government fixed the problem. Drives no longer need to be aware of simple maintenance items their vehicle requires. Luckily for us, oil change reminders only trigger a simple warning on the dash based on the mileage since the last reset.
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