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As Tom mentioned, specifics on how to change TPMS thresholds may be best found on a Toyota or Lexus enthusiast forum.
Not that it will help, but with all 3 of my FCA vehicles, I purchased an android app and OBD2 BT adapter and can manipulate pressures thresholds as well as dealer controlled PCM settings (DRLs, tires sizes, activating non-factory options, etc). Best $49 I spent on my Chryslers. My RAM's thresholds are locked down from the factory at 65/80 PSI. Now, the dash isn't lit up like a x-mas tree when I air down when not towing.
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2017 Keystone Bullet 308BHS in Saddle.
2017 RAM 2500 Laramie Mega Cab 4x4 Hemi 6.4L
2008 GMC Yukon XL Denali (SOLD)
Hensley SwiftArrow Control Hitch with 1000 lb Spring Bars
Me, DW, (3) little DS's, and 1 rambunctious Boston Terrier
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