2005 Toyota Sienna - tire pressure warning light after replacing one tire

A little googling suggests the system works not by measuring pressure but by using the ABS sensors to measure wheel revolutions. The replacement tire is not the same diameter as the other tires, which fools the system into thinking you've got one or more low tires.

No, the issue is that the diameters are different. You need to change tires in pairs. Replace the tire opposite of the new tire, and put a rim on it. Now you have a full-sized spare, better handling, and the light won't come on.

--scott

A normal situation after changing a tire. The new tire has a slightly different diameter than the previous tire and no longer compares to the data held by the tire warning system.

Given the tire pressures are correct, you simply need to reset the computer. Check your owner's manual, but the reset goes something like this:

Turn key on but don't start engine. Observe the tire light flash then stop. Press the reset button until the light starts flashing again then stops. That's it.

Gary (2002 Sienna)

if its an all wheel drive, you should probably replace all 4 at once, or at least in pairs. i don't know if that has anything to do with the warning light but it will be safer to drive.

Ensure all tires are 35 psi (recommendation for loaded Sienna, 32 psi in back if not driven with people or cargo, but 35 is fine too), then use the tire pressure monitor reset button to "relearn" the new tire diameters and pressures. The tire pressure monitor system description and reset procedure is in your owner's manual between pages 196 and

It probably won't be an issue using tires of two different wear levels, but there is always going to be some binding on the drive axle in such a case. The rear would be the best place for the new tire, but since you need to eventually perform a rotate, it's a moot point anyway. I always suggest replacing tires in pairs if the tread differential is too severe.

Toyota MDT in MO

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i was gonna say that.......exactly.

i was

yeah i was.........

ok......so i didn't know....fk it.

:)

~:~ marsh ~takes a sip of his shroomjuice.....wonders if there's anything... Fish doesn't know.......~ ~:~