The majority of new cars on the market have tire pressure monitoring systems that tell you when your tire pressure is low via a tire pressure sensor. This is usually the reason this light comes on in your car.

In most vehicles, there is a pressure sensor in each tire, which is linked to the light that appears on your dashboard when something's not quite right. Some cars also have a system that will turn this light on if one of your wheels is out of sync with the others in terms of speed and rotation.