![]() For most passenger cars, the recommended level is between 32 PSI to 35 PSI. The recommended level of air pressure is mentioned in the owner’s manual or at the sticker in the driver’s door. An inexpensive pressure gauge can do the trick, and you can use a compressor to fill the air inside the tire if it is below the recommended level. Therefore, regularly monitoring your tyre pressure is recommended by professionals. Apart from this, tire pressure can decrease over time as well. It is the reason that the tire pressure keeps changing by itself. It causes the tire pressure to increase, which leads to the TPMS light being turned off. Hence, the TPMS light is shown when the car remains parked overnight, and the outside temperature is low.Īfter driving around for a while, the tires heat up, which causes the air inside the tyres to expand. It allows the tires to cool down, which contracts the air inside the tires thereby, decreasing the tire pressure. In the morning, the outside temperature is low, and the car has remained stationary throughout the night. ![]() There is no need to worry as this is perfectly normal and in no way does it mean that your tires are leaking air. However, the TPMS light turns off later in the day when the vehicle has been driven around a little. The fluctuation in the outside temperature is the reason that your car’s Tire Pressure Monitoring System (TPMS) shows a warning light when you start your car early in the morning. The daytime and nighttime temperatures are remarkably different from each other. ![]() The most visible change is experienced in the fall season when the outside temperatures fluctuate rapidly. Tire pressure fluctuates regularly due to various reasons.
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