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I am assuming you have checked the owners manual and had no luck there. IF that is the case I would recommend taking it to the dealer and have it checked out. I know my Sienna has a tire pressure monitor but ir uns off of the ABS sensors. When one wheel is not running at the same speed as the others it willset off the light. However we had a 4Runner on the lot that had the sensors in the wheel for this. IT was part of the valve stem. Maybe you have a problem with one of those if your setup is that way.
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Chris
PLEASE DO NOT GET RID OF THE OLD TN AS WE KNOW IT.
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