I have seen an increase in the number of people complaining about their Tire Pressure Sensor systems on new cars. I took a look at the issue and have determined that they all have something to do with the cooler weather conditions seen all around the country. Now that so many manufactures are installing these systems as standard options people are now more aware of the fluctuations in tire pressure.
The culprit in the fluctuations in tire pressure come from the use of compressed air. Compressed air is basically atmosphere which is composed of 78% Nitrogen, 21% Oxygen, 0-4% water vapor and the remaining <1% balance of various other gases.
The problem with using compressed air is the water vapor. As the temperature of a tire changes the water vapor causes most of the change in pressure. Nitrogen on the other hand is dry and thermally stable.
Many tire shops offer Nitrogen filled tires, some offer this as a standard, but many shops still only use compressed air exclusively.
If you want to eliminate the warnings that pop up on you tire pressure monitors use Nitrogen filled tires and not only will the warning stop, but your tires will last longer and you should get better gas mileage. Toping off with compressed air shouldn