What is the light with an exclamation mark inside a semicircle?

[OAubrey]

It is the tire pressure monitoring indicator light. The tire pressure monitoring indicator light stays on, usually due to one of the following four situations: 1. Puncture causing the tire pressure monitoring light to illuminate: This situation typically involves very slow air leakage, making it difficult to immediately identify which tire is affected. You can use a tire pressure gauge to measure the pressure (front tires: 2.3 bar, rear tires: 2.5 bar). If the pressure is low, inflate the tire and then observe the tire pressure warning light. If it lights up again after a few days, take the vehicle to a 4S shop for inspection. 2. The tire pressure monitoring light may also illuminate due to excessive tire pressure: Standard tires: 2.4-2.5 bar; reinforced tires: 2.8-2.9 bar; the maximum pressure should not exceed 3.5 bar. If any tire exceeds 3.0 bar, it will trigger the tire pressure monitoring light. 3. Driving for too long with low tire pressure can cause the tire pressure monitoring light to illuminate: If a tire has low pressure, high-speed driving will increase the tire temperature, leading to a rise in pressure. In this case, stop and rest immediately or replace the tire with a spare. 4. The tire pressure monitoring light may illuminate due to prolonged lack of inflation, causing the pressure to drop below 1.8 bar. If the tire pressure monitor does not alert you in time, the monitor itself may be faulty. If the ignition switch is ON/START and the indicator light and TPMS light both illuminate for 2 seconds before turning off, it may indicate that the vehicle's original receiver has not been properly learned and bound, or that the receiver controller was replaced without being learned and bound.

[Morris]

That half-circle with an exclamation mark light on the dashboard always puts me on alert because it's the tire pressure monitoring system warning light, indicating that one or more tires have too low air pressure. Last month, I encountered it when it lit up while driving on the highway, scaring me into pulling over immediately to check. I found the right rear tire was slowly leaking. If not addressed promptly, the car would become unstable and shaky, fuel consumption would skyrocket, and there's even a risk of a blowout causing an accident. I recommend everyone develop the habit of using a tire pressure gauge to check monthly, keeping it within the range recommended in the owner's manual. Safe driving can't be taken lightly—small oversights can lead to big problems. Once the light comes on, don't hesitate; find a safe place to stop and go to a repair shop to inflate or check for leaks.

[EmilyLee]

As someone who loves tinkering with cars, I'm all too familiar with that tire pressure warning light! It comes from the vehicle's Tire Pressure Monitoring System (TPMS), which illuminates the icon when the air pressure falls below the normal range. The solution is straightforward: first, park the car safely, then use a simple tire pressure gauge to check each tire's pressure—typically recommended between 2.2 to 2.5 bar. If the pressure is normal but the light remains on, it might indicate aging sensors that need resetting or replacing. Maintaining proper tire pressure not only enhances handling but also reduces tire wear, saving you money on replacements. And let’s not forget how these smart alerts in modern cars make driving so much more reassuring.

[GabriellaLee]

This light immediately puts me on high alert because it warns of insufficient tire pressure. Low tire pressure can cause excessive tire deformation, affecting braking performance and handling, which is especially dangerous on highways and may lead to skidding or blowouts. I remember a friend who ignored it and ended up losing control of the car, resulting in a scrape. The solution is to stop immediately for a safety check on tire pressure or go directly to a repair shop for inflation. Long-term low pressure accelerates tire wear and increases fuel consumption. From a safety perspective, treat it as an emergency signal—glancing at the dashboard before each startup can prevent major trouble.