Why Does the Car Tire Pressure Light Always Stay On?

[OMichael]

The reason why the car tire pressure light always stays on is that the pressure in the four tires is not within the normal range. Generally, this is caused by slow air leakage leading to insufficient tire pressure or excessively high tire pressure, which triggers the tire pressure warning. Abnormal tire pressure usually occurs due to the following three reasons: Abnormal tire pressure: The warning light typically activates when the pressure is below 1.8 bar or above 3.0 bar. In such cases, a tire inspection and pressure adjustment are necessary. Tire pressure monitoring system not reset: After inflating the tires, if the tire pressure monitoring system is not reset in time, it will continue to display the previously recorded data, causing the tire pressure warning light to stay on. Simply resetting the tire pressure monitoring system will resolve this issue. Damaged tire pressure sensor: The tire pressure sensor, which monitors tire pressure, is installed inside the tire and connected to the tire inflation valve. If the sensor is damaged due to impact while driving, it can also cause the tire pressure warning light to illuminate. In case of sensor damage, the only solution is to replace it with a new one.