I have a 2010 Versa with nitrogen filled tires and the tire pressure light always turns on when the weather gets cold. It did it last year too and I took it to the dealership and they checked the pressure on the tire and added a little nitrogen and the light turned off and stayed off. Now mind you, I've driven this car cross country, no tire problems, and haven't had any since then until the weather got cold again. What is going on? The dealership said they can reset the sensor on it but will charge me. I'm unemployed right now so I don't have a lot of extra money and the nearest nissan dealership is six three miles away and there's only one shop in the town that I live in that has nitrogen for car tires.