Why does the tire pressure warning light still appear after replacing with a spare tire?

[PaisleeRose]

After replacing with a spare tire, the tire pressure warning light may still appear generally because the spare tire is underinflated or the tire pressure system hasn't been reset. If no visible damage is found, simply inflate the tire to normal pressure and reset the tire pressure monitoring system. If inspection reveals the spare tire has been punctured, drive promptly to a tire shop for repair, then reinflate it. If the low pressure warning reappears after inflation without any puncture, it might be caused by air leakage due to wheel rim deformation. It's recommended to check the wheel rim and replace if necessary. Low tire pressure can cause heavy steering, vehicle drift and other factors detrimental to driving safety. It also reduces the functionality of tire cords and rubber, leading to delamination or cord breakage, causing excessive friction between the tire and rim which damages the bead area and causes abnormal wear. Moreover, friction between the tire and road surface increases exponentially, causing rapid temperature rise that softens the tire and drastically reduces its strength. This may lead to tire blowouts during high-speed driving.