Why does a new car always have low tire pressure in one tire?

[DeCorbin]

New cars often have low tire pressure in one tire due to poor sealing performance of that particular tire. It is recommended that the owner have it inspected. Tires are the only components of a car that come into contact with the ground, and they are crucial for driving stability and safety. Tire pressure should neither be too high nor too low. Low tire pressure increases tire body deformation, leading to cracks on the tire sidewalls and causing flexing movements, which generate excessive heat, accelerate rubber aging, fatigue the cord layers, and even break the cords. It also increases the tire's contact area with the ground, accelerating wear on the tire shoulders. High tire pressure causes excessive stretching and deformation of the tire cords, reducing the tire's elasticity and increasing the load on the car while driving. In case of impact, it may lead to internal cracks or blowouts. Additionally, excessive pressure accelerates tread wear and reduces puncture resistance.

[Cameron]

I've encountered this issue several times where one tire on a new car keeps losing pressure. Within weeks of purchasing a new car, one tire gradually deflates. The most common causes include a nail or small stone puncturing the tire, leading to a slow leak; a loose or aging valve stem allowing air to escape bit by bit; or an imperfect seal between the wheel rim and tire, possibly due to manufacturing tolerances. Don't delay addressing this—low tire pressure not only increases fuel consumption but also compromises braking performance, and safety should always come first. I recommend checking tire pressure weekly with a home gauge and visiting a professional shop if readings fall below the recommended level. Developing this habit can save a lot of hassle, and if the car is still under warranty, getting it fixed for free is even better. Taking prompt action can prevent being stranded on the road.

[Prim]

A new car's tire pressure consistently being low is commonly caused by damage to the tire itself, such as a small hole leading to air leakage, possibly due to road debris puncturing it; poor sealing of the valve core assembly, resulting in slow air leakage; or uneven wheel rim edges causing gaps due to misalignment during installation. In the case of a new car, assembly issues are more likely. Low tire pressure affects handling stability and increases the risk of a blowout. You can try spraying soapy water on the tire surface to observe bubbles and locate the leak. It's recommended to take it to a 4S shop for inspection and repair, as they are skilled in addressing such new car defects. Regular tire pressure monitoring can effectively prevent unexpected incidents.

[OReed]

For low tire pressure issues, I usually start by checking the tire surface for nails; listen for any hissing sounds of air leakage; and spray soapy water around the wheel rim interface to look for bubbling spots. If I can't fix it myself, I go to a repair shop for testing. For new cars, the cause might be loose valve stems or poor wheel rim sealing. Don't take shortcuts or delay—low tire pressure wears out tires quickly and is dangerous. Address it promptly to ensure safety.

[HaydenAnn]

The reason why the tire pressure is always low is mostly due to slow leaks: tire damage such as punctures; aging valve components causing air leakage; or poor wheel rim sealing leading to gaps. In the case of new cars, improper assembly or transportation impacts are the main causes. Low tire pressure not only increases fuel consumption but also affects steering precision. If you confirm a significant deviation using a tire pressure gauge, professional air tightness testing is required. Regular checks ensure driving safety and extend tire life, saving money and hassle.