**edit 2

It went away today... But it'll be back, and in greater numbers

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*edit

Finally found another post with a similar issue. The tire pressure error I'm getting is a TPMS malfunction error, not a tire pressure error. Either the sensor is off, the dealership did something wrong, or the valve stems won't work with the system.

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Hey guys,

I just got my xB yesterday, and the dealership put on my wheels/ tires. Enkei J10 17's with Dunlop SP Sport Signature tires. They are the proper size tires for the wheels. Just over 24 hours and 100 miles and the tire pressure light has turned on. The pressure in the wheels seems fine, though I haven't measured the psi yet. I'm guessing it's a problem with the tpms, but why would that give me problems after a day and not immediately?

Doh.