u003cliu003eu003cspan style=u0022font-weight: 400;u0022u003eIt’s normal for tires to lose air over time; the same thing happens to balloons. Air slowly leaks out through the tire on a molecular level. If the tire has a puncture of some kind, this will cause it to lose air as well as if the tire pressure sensor o-ring is leaking.u003c/spanu003eu003c/liu003e