I have to give "props" to the tire air pressure sensor in the Xterras. The other week, when it got really cold, my air pressure sensor light came on. I checked the air pressure and all 4 tires were at 28 PSI. I immediately thought there was a sensor problem because I didn't think the system was sensitive enough to notice a 4 PSI difference between what is recommended (32 PSI). I filled all the tires to 32 PSI and waited to see if it would happen again. The light went off and I have started the vehicle several times in even colder weather and the light didn't come back on. IMPRESSIVE!!