I thought I was being nice?
I answered his question. TPS alarms are designed turn off by themselves once the required pressure is back in the tire. If it's not turning off by itself, it's possible the sensor module is faulty or the valve stem has come dirt in it, but the first thing is to check the tire pressure against recommended factory settings as listed in the owners manual.
I know this the hard way, because when I first got my Xterra, the same thing happened to me. I'd never owned a vehicle with TPS system before, so I took it to the dealer (it was under warranty). In my case, it was because of a cold snap causing the air to compress just enough to go past the TPS pressure setting. The dealer sold me a line of BS and charged me $50 to "reset the sensor". Turns out they just put air in the tires and waited for it to go off by itself. I was trying to save the OP some hassle.