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The wife has an 04 Toyota 4Runner. Last fall when the temps began dropping the "low tire pressure" alarm came on. I checked all 4 tires and found them to be about 2 lbs. low and aired them up to correct pressure. A couple days later, the alarm was back. I had negelected to check the spare and the system monitors it also. I don't have any idea how it monitors the tire pressure, but it will let you know in a hurry if you have a low tire. We all are probably guilty of ignoring the spare. Thanks for the reminder.
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