What Causes Low Tire Pressure Warning?
2 Answers
Tire pressure deficiency may be caused by air leakage due to wheel hub deformation. It is recommended to inspect the wheel hub and replace it if necessary. Load Capacity: For empty or partial loads, refer to the lower limit of tire pressure indicated on the vehicle's sticker as a reference value; for full loads, refer to the upper limit of tire pressure indicated on the vehicle's sticker. Tire Pressure Measurement Conditions: The tire pressure differs between cold and hot tires, with a difference of approximately 0.2-0.3. To obtain an accurate tire pressure reading, it is best to measure after the vehicle has been parked for several hours. Otherwise, subtract 0.2-0.3 from the hot tire measurement to get the tire's cold inflation pressure. Driving Conditions: If frequently driving long distances or on highways, the tire pressure should not be too low. It is advisable to increase the tire pressure by approximately 0.2 above the standard pressure. If frequently driving on rough or uneven roads, it is advisable to decrease the tire pressure by 0.1-0.2 below the standard pressure. Under normal conditions, these adjustments can be negligible.
Last time I went on a long-distance trip, I encountered a tire pressure warning. When I pulled over at the service area, I found a screw punctured in the right rear tire. It had been slowly leaking for three days, and the tire pressure had dropped to only 1.6 bar. This kind of nail puncture is the most common, especially on rainy days when the road surface tends to trap sharp objects. Also, remember to check the valve core, as aging and cracking can also cause slow leaks. Wheel rim deformation is even more troublesome—my friend's car had a leak because the rim edge was bent after hitting a pothole. The tire repair shop technician said it's normal for tire pressure to increase by 0.2 bar in summer due to high temperatures, but if it drops by 0.3 bar overnight in winter, you should be alert. Keeping an air pump handy is especially practical.
