The method to reset the tire pressure indicator on a Passat is as follows: After addressing the tire pressure issue, first turn on the ignition, then press and hold the tire pressure monitoring reset button until you hear a "ding" sound before releasing it. The tire pressure monitoring system will then store the current normal tire pressure data, automatically clear the previous data, and finally, the warning light on the dashboard will turn off, completing the tire pressure reset. Tire pressure monitoring involves real-time automatic monitoring of tire pressure during vehicle operation, alerting the driver to tire leaks or low pressure to ensure driving safety. There are three common types of tire pressure monitoring systems: Direct Tire Pressure Monitoring: This system uses pressure sensors installed in each tire to directly measure tire pressure. The pressure information is transmitted wirelessly from inside the tire to a central receiver module, which then displays the data for each tire. The system automatically alerts the driver if the tire pressure is too low or if there is a leak. Indirect Tire Pressure Monitoring: When the pressure in a tire decreases, the vehicle's weight causes that tire's rolling radius to become smaller, making it rotate faster than the other wheels. By comparing the differences in rotation speed between tires, the system monitors tire pressure. Indirect tire pressure warning systems essentially rely on calculating the rolling radius of tires to monitor pressure. Introduction to Tire Pressure Monitoring System (TPMS): This system combines the advantages of both direct and indirect systems. It equips direct sensors in two diagonally opposite tires and includes a four-wheel indirect system. Compared to using only direct systems, this hybrid approach reduces costs and overcomes the indirect system's inability to detect simultaneous low pressure in multiple tires. However, it still cannot provide real-time data on the actual pressure in all four tires as a direct system does.
