Cold Press.” embossed on their sidewalls. However, contrary to popular belief, you should not use this pressure in your tires! The correct air pressure will be on a plaque riveted inside the driver's front door. This is the car manufacturer's recommended pressure, based on the weight of the car and the tire size.
The various tire pressure monitoring systems (or TPMS) used by auto makers are designed to monitor the air pressure in a car's tires.The idea behind a TPMS is primarily safety-related -- underinflated tires offer a less stable ride, and they're more prone to possible blowouts.