At what tire pressure level should a car not be driven?

[DelElena]

Tire pressure should not be lower than 1.2bar. Tire Pressure Monitoring System (TPMS) Warning Light: The TPMS warning light is a yellow symbol featuring an irregular circle without a seal at the top, with four small spikes at the bottom and an exclamation mark inside. The illumination of the TPMS warning light indicates abnormal tire pressure. Causes of Abnormal Tire Pressure: Typically, an alarm will trigger when the pressure is below 1.8bar or above 3.0bar, necessitating tire inspection and pressure adjustment. If the tire pressure is not reset promptly after inflation, the TPMS may continue to display outdated data, causing the warning light to stay on—simply resetting the tire pressure can resolve this issue. The tire pressure sensor, installed inside the tire and connected to the inflation valve, monitors tire pressure. If damaged during driving (e.g., by hitting a curb), it can also trigger the TPMS warning light. In cases of sensor damage, replacement with a new component is the only solution.

[EstherFitz]

Never drive with tire pressure below 1.5bar - this is a hard-earned lesson from my 15 years in freight transportation. Low tire pressure causes severe sidewall deformation, making the vehicle feel like driving on mud with unstable steering and increased fuel consumption. It's especially dangerous in summer when friction-induced heat can lead to sudden blowouts. I've seen too many drivers trying to limp to repair shops, only to have their wheel rims deformed midway. Always keep a mechanical tire gauge handy - measure when tires are cold for most accurate readings. If pressure is below 1.8bar, refill immediately without hesitation. If the tire pressure warning activates on highways, immediately turn on hazard lights, slow down, and pull over - safety must always come first.

[StWalter]

A tire below 1.5 bar is like a deflated basketball—impossible to drive normally. Last time I had a nail puncture that dropped the pressure to 1.2 bar, and after just two kilometers, the wheel rim had already worn cracks into the tire sidewall. The mechanic explained that under-inflated tires cause the rubber and carcass layers to flex excessively, generating heat and shortening tire lifespan by two to three times. He recommended checking tire pressure monthly when using the coin method to inspect tread depth, with standard values for regular cars usually listed on the door frame. Many gas stations now offer free air pumps—top up immediately if pressure falls below 1.8 bar, don't wait until it's completely flat. Run-flat tires can travel 80 km without air, but exceeding 40 km/h remains dangerous.

[StLevi]

A tire pressure as low as 1.3 bar requires immediate parking, otherwise the wheel rim may directly damage the road surface. My neighbor in the community stubbornly drove with a tire pressure of 1.6 bar, resulting in a deformed rim when passing over a speed bump, costing over 4,000 yuan in repairs. Normal tire pressure ensures even contact area of the tire with the ground, whereas under low pressure, only the tire shoulders bear the force, making it prone to loss of control during steering. Beginners are advised to purchase a digital display air pump to keep in the trunk; if the tire pressure is found to be 25% below the standard value, do not drive. For example, if the standard tire pressure for an SUV is 2.2 bar, anything below 1.65 bar poses a risk. Always check the tire pressure when the car is cold before a long trip, as measuring a hot tire can read about 0.3 bar higher than the actual pressure.

[ChloeLynn]

A tire pressure below 1.5 bar is absolutely prohibited in real-world tests. Once, my tire pressure dropped to 1.4 bar, and I clearly felt the tires wobbling during turns, like walking on stilts. Low-pressure driving is most damaging to the tire sidewall cords, and the tire repair shop owner said this damage is irreversible. The critical threshold varies by vehicle type: compact cars have a lower limit of about 1.5 bar, while fully loaded SUVs require even higher pressure. Sudden air loss might be due to a nail puncture, while slow leaks are often caused by aging valve stems. Keeping an emergency tire sealant in the car can last for dozens of kilometers, but it’s only a temporary fix. If you notice low tire pressure, find a nearby repair shop immediately—forcing the drive will only double the repair costs.

[EmiliaDella]

It's necessary to stop and check when tire pressure drops below 1.8 bar. Last week my tire pressure was at 1.7 bar, fuel consumption directly surged from 7L to 9L, and the steering wheel became particularly heavy. Under low pressure, the tire contact area increases by 30%, and the rolling resistance becomes significantly higher, leading to much higher fuel consumption. Worse still, prolonged driving with low pressure can cause abnormal wear on the tire crown, leading to premature failure. It's recommended to use tire pressure monitoring caps for real-time observation—green indicates normal, while turning red means it's below 1.5 bar. In winter, tire pressure loss is faster, so it's important to top up monthly. If you encounter a low-pressure warning on the highway, avoid sudden braking and slowly drive into the service area for handling.