First things first, check all four tires for nails, tears or any damage that might cause it to lose pressure. Next, use a tire pressure gauge on the tire (or tires) that your system indicated had low pressure. Compare the tire’s psi with the manufacturer’s recommended psi, which can be found in your owner’s manual or on the sticker inside of your driver’s side door jam. (To find this sticker, click here.) If pressure is low, add air until it reaches the proper pressure. If your light continues to stay on, take your vehicle to an authorized tire dealer immediately.