Why doesn't a tire pressure of 1.9 trigger an alarm?
3 Answers
A tire pressure of 1.9 not triggering an alarm is because the minimum tire pressure alarm threshold varies for each vehicle model. This is mainly related to the settings of each vehicle's onboard computer. Generally, the low-pressure alarm threshold for most vehicles is set at 1.9. Hazards of excessively low or high tire pressure: Both underinflation and overinflation can shorten tire lifespan. Underinflation increases tire deformation, making the sidewalls prone to cracking. It also causes excessive flexing, leading to overheating, accelerated rubber aging, and even blowouts. It enlarges the tire's contact area with the road, accelerating shoulder wear. Overinflation causes excessive tire expansion and reduced elasticity, increasing the risk of blowouts upon significant impact. It also leads to rapid tread wear. Functions of tire pressure monitoring alarms: Prevent blowouts by monitoring tire pressure and temperature in real time, addressing issues before they occur. Save fuel by maintaining correct tire pressure, reducing vehicle fuel consumption. Reduce wear – insufficient pressure causes excessive wear (tire scrubbing) and shortens tire lifespan.
The tire pressure dropped to 1.9 but no alarm was triggered. I've encountered this several times, which might be related to the alarm threshold setting. Having driven different types of vehicles, I noticed many models set the alarm threshold at 1.8 or lower. For example, German cars often set it at 1.7, while American cars might set it at 2.0, so 1.9 is right on the borderline and didn't trigger the alarm. Alternatively, there might be an issue with the sensor, such as a dead battery or signal loss, causing the system to misjudge. I recommend first checking the vehicle manual to confirm the standard value. Pressure below the recommended range can accelerate tire wear and increase the risk of a blowout, especially reducing handling stability at high speeds. Develop the habit of using a digital pressure gauge to check monthly—don't rely entirely on the alarm system. If you notice similar issues, promptly visit a professional repair shop to check the sensor or recalibrate the system. Safety comes first.
I usually enjoy tinkering with my car. If the tire pressure is at 1.9 without triggering an alarm, it could be due to a sensor battery issue or the need to reset the system. Last time my car had the same issue, I removed the wheel, replaced the battery, and it went back to normal. If it's not the battery, try the reset button—turn off the engine, turn the key to the ON position, and hold the TPMS button on the dashboard for a few seconds. Some cars have a higher alarm threshold, so 1.9 may not be considered dangerous, but temperature has a big impact: in cold weather, it may show low pressure but not trigger an alarm after system compensation. Check the tires for any deformation or cracks. For safety, buy a diagnostic tool to read the codes. Performing simple maintenance yourself can save repair costs and ensure peace of mind while driving.
