What causes the tire pressure warning in the 2020 Mazda 3?

[DeBrandon]

The tire pressure warning in the 2020 Mazda 3 is generally caused by sensor failure. The tire pressure monitoring system automatically monitors the tire pressure in real-time while driving and alerts the driver to air leaks or low pressure to ensure driving safety. The related explanations are as follows: Abnormal tire pressure: The system typically triggers a warning when the pressure is below 1.8 bar or exceeds 3.0 bar. In such cases, the tires should be inspected and the pressure adjusted. Tire pressure monitoring not reset: After inflating the tires, if the tire pressure is not reset promptly, the monitoring system will still record the previous data, causing the tire pressure warning light to illuminate. Simply resetting the tire pressure 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 inflation valve. If the sensor is damaged due to impact while driving, the tire pressure warning light may also turn on. In the case of sensor damage, the only solution is to replace it with a new component.

[PaisleeLynn]

Don't panic when your Mazda3's tire pressure warning light comes on - the most common cause is a punctured tire from a nail. Last week, my neighbor's identical car had the light on, and upon inspection, we found a screw lodged in the right rear tire. A quick patch job costing 80 yuan fixed the issue. Additionally, autumn temperature drops frequently trigger warnings - for every 10°C decrease in temperature, tire pressure drops by approximately 0.1 bar. It's advisable to manually check all four tires with a gauge when the car is cold in the morning; the standard values are listed on the sticker inside the driver's door frame. If the warning persists after patching, remember to reset the system by long-pressing the SET button with an exclamation mark on the left side of the steering wheel.

[ODaniel]

My 2020 Mazda 3 triggered alarms three times last year, revealing several pitfalls: failing to adjust tire pressure during seasonal changes tops the list—the tire pressure monitoring sensors are extremely sensitive, alarming at deviations over 0.3 bar; using an impact wrench to forcefully remove rims during tire repairs can easily damage the sensors; and improperly installing the sensor sealing ring when modifying rims allows high-pressure car wash jets to flood them. Most frustrating is the battery issue—the sensors use 2032 button cells, and running out of power still causes false alarms, with replacements at the dealership costing over 200 yuan.

[Sandy]

Don't just focus on air leakage when the tire pressure light comes on—I learned this the hard way. Once, after an alert, I found the left front tire was 0.5 bar lower than the other three. After refilling, the alarm went off again the next day. Only after lifting the car and rotating the tire did I discover a tiny crack on the wheel rim edge, causing a slow leak when hitting bumps. Additionally, abnormal tire temperature can also trigger it, such as when brake pads on one side overheat during highway driving and transfer heat to the wheel rim. Or, installing only two snow tires in winter can cause a speed difference between front and rear wheels, making the system think there's a leak. I recommend keeping a portable air pump in the car.