Why does the tire pressure warning keep coming on when there's no nail puncture?

[DeAllie]

Tire pressure is normal without any nail punctures, but the abnormal tire pressure warning indicates there might be a slight fault in the transmission circuit of the tire pressure monitoring system. It is recommended to have it checked. Generally, the normal tire pressure for passenger cars is around 2.2-2.5 bar, which is a standard. However, not all vehicle models follow this standard. For example, SUV models usually have slightly higher tire pressure than passenger cars, so the specific standard should be based on the manufacturer's guidelines. According to the international GBT2978-2008 standard, the tire pressure for different types of tires is as follows: Standard tires: 2.4-2.5 bar; Reinforced tires: 2.8-2.9 bar; Maximum pressure: should not exceed 3.5 bar. In winter, the tire pressure should be adjusted slightly higher by about 0.2 bar based on the standard tire pressure for car tires. Generally, the lower limit of the standard tire pressure for car tires is sufficient. For example, the lower limit for standard tires is 2.4 bar. If the car is often parked outdoors, the tire pressure can usually be about 0.1 bar lower than the standard to prevent tire blowouts due to high temperatures.