The quick answer.
Check tire pressure with a gauge when the tires are cold, using the vehicle’s door-placard or owner’s-manual pressures rather than the maximum printed on the tire. NHTSA recommends checking at least monthly, including the spare if fitted. Recheck after adding air.
The steps at a glance.
Read the vehicle target
Locate the cold pressures on the door placard or in the manual, noting any front, rear and spare differences.
Measure before driving
With cold tires, remove a valve cap, seat the gauge firmly and read the pressure. Repeat around the vehicle.
Adjust with suitable equipment
Add air where needed, following the inflator instructions. Avoid guessing from the tire’s appearance.
Recheck and finish
Measure again, replace caps and note any recurring loss or damage that needs inspection.
Find the pressure for your vehicle, not a universal PSI
There is no single correct pressure for every passenger car, SUV or pickup. The important starting point is your own vehicle’s tire-information placard, usually near the driver’s door, and the owner’s manual. Read the front and rear entries separately. A spare can have its own requirement. If the tire size or vehicle setup has changed from the original specification, get fitment-specific advice rather than choosing a number from an unrelated car.
A cold reading makes the comparison useful
NHTSA defines cold tires for this check as tires on a vehicle that has not been driven for at least three hours. Plan the check before leaving home instead of making the first measurement after a motorway drive. The point is consistency: you want a reading that can be compared with the vehicle’s stated cold pressure. Do not release air from a hot tire just to make it match the cold target; arrange another check when it has cooled.
Keep a small kit you will actually use
A readable pressure gauge, access to a suitable inflator and a place to note readings make the task easier to repeat. We would prioritise a gauge that connects cleanly to the valve and has a display you can read in your parking location. A compact inflator can be convenient for minor top-ups, but a long hose or cordless design is only useful if it reaches the valves on your vehicle. Check units before comparing readings: PSI and kPa are different scales.
Do not wait for the dashboard light
A tire-pressure monitoring system is a warning system, not a replacement for a scheduled gauge check. NHTSA notes that its warning may only appear once a tire is significantly underinflated. A monthly reminder gives you an opportunity to notice a pattern before it becomes your next roadside problem. Michelin also recommends a check before a long journey. If one tire repeatedly loses pressure, arrange an inspection instead of treating frequent top-ups as the solution.
Use a repeatable check rather than chasing the last decimal
Work around the vehicle in the same order and compare each reading with the correct front, rear or spare target. If the gauge hisses continuously, reposition it for a proper seal and take another reading. After adjusting pressure, check again and replace the valve cap. Write down a recurring difference or an uncertain reading so it can be investigated. If a tire appears damaged or will not retain pressure, the next step is professional assessment, not more guesswork with the inflator.
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Your questions, answered.
What PSI should my car tires be?
Use the cold pressures specified on your vehicle’s tire placard or in its owner’s manual. The maximum on the tire sidewall is not the normal target for every vehicle.
How often should I check tire pressure?
At least monthly, including a fitted spare, following NHTSA guidance. Also check before long trips and investigate repeated pressure loss.
Can I rely on the TPMS light?
No. Keep a monthly gauge-check routine; the warning may only appear after significant underinflation.
Sources & further reading.
Source information checked October 21, 2026. Product examples are identified by model; the recommendations and practical comparisons are CarRundown’s editorial analysis.