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It would help to know what year and model your Lexus is to better assist you. Typically if you haven't done anything to the car or tires, it may be low on air if the message is "low tire", if message is "check system" or "service tpms" then it may be more involved like a bad tire sensor or other system malfunction. Let me know more info and we can go from there.
If the tires were the exact size the problem would not be there. Replace the sensor to the size tires or replace the tires back to the same size it was before
Depending on what type of monitor it has its could be an easy fix. If they use a band type monitor that wraps around your wheel just have your tire shop pull the monitors off all your wheels and put all four of them on your spare. Given, you'll never know when your tires are low via dash light but we all managed to do without that for years anyway. On the plus side you'll be POSITIVE on the pressure of your spare.
There is a Fuse that is labeled (hzd, or Hazard ) remove it for 15 sec. and return to position it should reset the whole system then check and see if it goes back to original operation good luck
the dealer will have to do it its a program in the car computer that is set up to monitor tire pressure since you changed the pressure the computer knows the change and is letting you know there is a possible leak.you can have it altered at the dealer only.
I have a 2004 Silverado with the same problem.
After scrollng the internet for months and reading every manual I could get my hands on, I found, for me, a quick and easy way. Open the hood, remove the cover to the Underhood Fuse Block on the drivers side of the vehicle near the battery.
If you have the manual for your truck, go to page 5-126 and locate the fuse that says IPC/DIC, it is a 10 amp fuse.
Pull the fuse and start your truck or a few sceonds.
You will notice that nothing on your insterment will work.
Turn engine off and replace fuse.
After I did this, the message did not come back, and started my truck about 15 times to make sure.
It worked for me....good luck to you.
32 psiis actually low for a 3500. I have a 1500 silverado that runs 44 psi cold. The tire inflation monitor , monitors inflated cirunference. Sooooo, If it isn'nt round enough, it will let you know. Driving warms up both the air and the tire,off course changing everything again. Pressure is up and tire is bigger. Ask me not how it can tell what is going on with the tire sitting still. I'm only on page 9,000, the answer is here somewher. :-) Well good luck. I do know the above is accurate._Ned_
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