In detail about the tire pressure monitoring system

A gradual loss of pressure or a sudden one is not of great importance. In any case, it is extremely dangerous. Only with a gradual loss is there a chance not only to avoid an emergency situation but also to protect the tire from complete destruction.   This is why the tire pressure monitoring system, or TPMS, is an essential addition to ensuring safety.  This technology can provide you with the information that will help you keep your tires in good condition and prevent an emergency situation.  

The TPMS sensor, or tire pressure sensor, is an integral part of this system. Today we will find out how the car tire pressure sensors work.

What is a TPMS sensor?

A TPMS sensor is an electronic device that monitors the air pressure in a car's tires.  If the air pressure drops to a dangerously low level, a standard warning is issued.
In some countries, the presence of TPMS sensors is standard equipment for all new cars.  Even if your car is not equipped with pressure sensors, they can be installed additionally, which many do.  

How do car tire pressure sensors work?

There are two types of tire pressure monitoring systems: direct and indirect.  Each has its own method of operation.

Direct TPMS monitoring system: With this system, sensors are installed on each wheel of the car.  These sensors monitor the air pressure in each tire.  If the air pressure in one or more tires drops below 25% of the norm recommended by the car manufacturer, the sensor sends this information to the car's computer, which leads to the illumination of a warning lamp on the dashboard.

Indirect TPMS monitoring system:  this setup works with wheel speed sensors in the anti-lock braking system (ABS) of your car.  If a tire has little air, it will roll more slowly than a tire with sufficient air pressure.  If the sensors detect a difference in wheel speed, the system assumes that the problem is caused by a lack of air in the tire.  The system alerts the car's computer, which illuminates a warning lamp on the dashboard.
How do TPMS sensors get power?

Lifetime of the sensors.

TPMS sensors are powered by batteries designed to last for several years.  However, these batteries will not last forever and will lose their charge over time.  Usually, the battery is connected to the TPMS sensor in the assembly, so it is often impossible to replace it.  For this reason, in case of battery discharge, it is necessary to replace the entire tire pressure monitoring system.

Are TPMS sensors designed for a specific car?

In cars with factory-installed TPMS sensors, the sensors are always vehicle-specific.  Automakers purchase these systems from specific suppliers, and the supplier may vary from model to model.  If you use an incompatible TPMS sensor, it is likely to not work with your car's system.