How to Check Tire Pressure
Check tire pressure cold, against the number on your doorjamb sticker, not the number printed on the tire.
Use a gauge, check the number on your car, not the tire
Find the recommended pressure on the sticker inside the driver's door jamb, or in your owner's manual. That number is for your car. The number molded into the tire's sidewall is the maximum the tire can hold, not what your car needs.
Check the pressure with the car's tires cold, meaning it has been parked for a few hours or driven less than a mile or two. Press the gauge onto each valve stem until the hissing stops, read the number, and compare it to the sticker. Add air if it's low, release some if it's high, and check again.
Why cold tires matter
Driving heats the air inside a tire, and that raises the pressure reading. A tire that looks fine after a highway drive might actually be underinflated once it cools back down.
This is why checking in the morning, before you've driven anywhere, gives you the truest number. If you have to drive to a gas station for air, check the pressure first so you know how much to add, then recheck once you're there.
Temperature swings between seasons change tire pressure even if you haven't driven anywhere. A tire that was fine in warm weather can read low once the temperature drops, so it's worth checking again when the weather turns.
What low or uneven pressure does to the car
Underinflated tires wear faster on the outer edges and make the car harder to control, especially in rain or on a quick turn. Overinflated tires wear faster in the center and ride harsher than they should.
If one tire is consistently lower than the others, that's often a sign of a slow leak rather than normal air loss. Worth having a tire shop check it before it becomes a flat.
Many newer cars have a tire pressure warning light, but it usually only comes on once pressure is significantly low. Checking by hand, on a schedule, catches problems before that light does.
Questions people ask about this
How often should I check my tire pressure?
Check it at least once a month, and before any long drive. Tires lose a small amount of air naturally over time, and that loss adds up faster than most people expect.
What should my tire pressure be set at?
Use the number on the sticker inside your driver's door jamb or in your owner's manual. That number is specific to your car's weight and tire size, so don't use a number you remember from a different vehicle.
Does tire pressure affect gas mileage?
Yes, underinflated tires create more rolling resistance, which makes the engine work harder. Keeping tires at the recommended pressure is one of the simpler ways to keep fuel use consistent.
Can I check tire pressure without a gauge?
Not reliably. Looking at a tire rarely tells you whether it's low, especially with modern tires designed to hold their shape even when underinflated. A gauge, which is inexpensive and small enough to keep in the glove box, gives you an actual number to compare.
Does a tire pressure problem affect my insurance?
It can affect a claim if it contributed to an accident, since an insurer may look at whether the vehicle was properly maintained. Check with your own insurer about how they view maintenance-related issues if you're unsure.
If tire wear or a dashboard warning has you thinking about your coverage, it's worth seeing what else is out there.
Find your tire's recommended pressure on the door jamb sticker and write it down somewhere handy, like your phone. Buy a simple tire gauge if you don't already have one. Check all four tires once a month, always before driving, and top off air at a gas station if needed. If you notice one tire losing air faster than the others, get it looked at before it becomes a bigger problem. Keep an eye on pressure when the weather changes, since cold mornings often reveal a tire that was already running low.
