Check and adjust the tire's air pressure at least once a month or every time you go on a long trip. To check the air pressure in your tires and make the necessary adjustments, use a tire pressure gauge and either an air compressor or an inflator. The recommended air pressure for your tire can be found on the sticker inside the driver's door, on the tire sidewall, or in the owner's manual. Keep the air pressure within the recommended range, as underinflated or overinflated tires can affect your tire's performance, safety, and lifespan.