What are the reasons for abnormal tire pressure display?
4 Answers
There are three reasons for abnormal tire pressure display: abnormal tire pressure; the tire pressure monitoring system has not been reset; the tire pressure sensor is damaged. Abnormal tire pressure: Generally, an alarm will be triggered if the pressure is below 1.8bar or above 3.0bar. In this case, tire inspection and pressure adjustment are required. Tire pressure monitoring not reset: After inflating the tires, if the tire pressure is not reset in time, the tire pressure monitoring system will still record the previous data, causing the tire pressure monitoring indicator light to illuminate. In this case, simply reset the tire pressure. Tire pressure sensor damaged: The tire pressure sensor is used to monitor tire pressure and is directly installed inside the tire, connected to the tire inflation port. If the tire pressure sensor is damaged during driving due to impact, it will also cause the tire pressure warning light to turn on. For sensor damage issues, only a complete replacement with a new part is possible.
As a veteran truck driver who's been hauling freight for years, I've encountered tire pressure warnings over a dozen times. The most common issue is slow leaks caused by nails or glass shards puncturing the tires, which happens particularly frequently near construction sites. Then there's the sudden pressure drop during winter temperature plunges - last year when it hit -15°C, my tire pressure dropped by 0.3 bar directly. Tire aging cracks or leaking valve stems are also quite common; just last week I helped a friend replace his valve stem. The most troublesome scenario is false tire pressure monitoring alerts - when sensors get caked with mud, they trigger erroneous warnings, which can usually be fixed by wiping the sensors with a damp cloth. I recommend keeping a portable tire pressure gauge handy for quick checks at highway rest areas.
My used car has had three instances of abnormal tire pressure, each requiring extensive troubleshooting. Sometimes it's caused by slow air leakage due to wheel rim deformation, especially common in vehicles that frequently curb their wheels. Faulty tire pressure sensors are also not uncommon - when the original sensor's battery runs out, it can trigger false alarms. Recently, I discovered a new issue: improper wheel balancing after tire repairs can trigger tire pressure warnings when tire temperatures rise during highway driving. In summer, tire pressure can surge by more than 0.5 bar after sun exposure, returning to normal when parked in shade to cool down. I recommend checking tire pressure sensor battery levels during each maintenance service, as such hidden issues are difficult to detect in advance.
The three most common culprits of abnormal tire pressure are: punctured tires, temperature changes, and tire pressure monitoring system failures. Last week, my car had a nail puncture, and the tire pressure dropped from 2.5 to 1.8 bar in two days. In the cold winter mornings, tire pressure warnings often appear at startup but disappear automatically after driving for ten minutes when the tire temperature rises. Insufficient spare tire pressure is also a hidden danger, as many people haven't checked their spare tire pressure in three or four years. Slight air leakage caused by wheel rim oxidation is particularly hard to detect, and it becomes more noticeable after high-pressure water jets at car washes hit the rims. Buying a tire repair kit is quite practical for emergency handling of minor leaks, which can save on towing fees.
