[SoNic67]

The last post was in Sept 2014, 5-1/2 years ago! How deep did you dig to find it?

 

[SoNic67]

You can check which one is bad using Techstream software

It just gives you the serial number of the low battery one or... that one is dead. How you actually know which one it is?

 

[SoNic67]

Thanks, I was going to try to add air to see if it works.

PS: Wow. He is one of them guys that keeps 40psi in his tires. Because...Toyota's engineers are morons?

 

[SoNic67]

Yep - 40 psi in my road tires as well, helps a lot with handling on our twisty mountain roads, may yield a marginal increase in fuel mileage. 45 psi in the spare as does RTexasF.

I strongly believe that's just placebo thinking. I trust all the car manufacturers engines when they put 32-35psi on those labels, and not the max those tires can handle. One can increase the pressure if the car is loaded more, but most of the time they drive just with one driver.

Higher pressure makes the contact patch smaller, so that's less grip - in turns or braking.
Also, when it hits high-frequency bumps (like small cracks in the road, expansion joints, etc), instead of absorbing the shock energy, it just provides a jarring, instant, reaction force, that diminishes further the rubber contact pressure with the asphalt. If you want the wheel "jumps" instead of staying compliant on the same path.
With high pressure, when I hit those joints in a turn (highway cloverleafs), at my relative high speed (high lateral g), I can feel the car "sliding" sideways when bouncing off those cracks. Shocks can take care only on low-frequency bumps, cannot react that fast.
In final, those jarring forces are transmitted to the suspension components (instead of being absorbed by the air and tire wall rubber), and usually the rubber bushings take the blunt. I can't imagine that being good for them.

Anyway... more power to you.

 

[SoNic67]

Replacing them one by one ends up costing more. The batteries last 10 years, if that 2004 Sienna didn't complain, probably the reader doesn't work (and they are all dead). Someone posted how to invalidate the reader with just a jumper, so it's possible to be done.

Toyota OE sensors $99/4pcs:

Amazon.com: TOYOTA OEM Tire Pressure Monitoring System (TPMS) Transmitter (FCC ID: GQ4-45T, P/N: 42607-0C070): Automotive

Buy TOYOTA OEM Tire Pressure Monitoring System (TPMS) Transmitter (FCC ID: GQ4-45T, P/N: 42607-0C070): Replacement Sensors - Amazon.com ✓ FREE DELIVERY possible on eligible purchases

www.amazon.com

Non OE sensors $61/4pcs

Amazon.com: CDWTPS Tire Pressure Sensor,42607-33021 TPMS Sensor,PMV-107J 315Mhz Tire Pressure Monitoring System Compatible with Toyota,Lexus,Scion(4-Pack): Automotive

Buy CDWTPS Tire Pressure Sensor, 42607-33021 TPMS Sensor, PMV-107J 315Mhz Tire Pressure Monitoring System Compatible with Toyota, Lexus, Scion(4-Pack): Automotive - Amazon.com ✓ FREE DELIVERY possible on eligible purchases

www.amazon.com

 

[SoNic67]

They should at least offer the option. But a lot of people think that those offers are just scams... and get aggravated.
So that's a decision that Costco had to make.