Where to look
Open the driver's door and look at the door frame itself (not the door) — it's usually a white or silver sticker near the latch, sometimes on the fuel door or glovebox instead.
Why "cold" matters
Check pressure before driving, ideally in the morning. Driving heats the air inside the tire and temporarily raises the reading — checking cold gives you the number that actually matches the placard.
Front and rear can differ
Many vehicles call for different front and rear pressures. Set each axle to its own number, not one pressure across all four.
Don't use the tire's sidewall number
The "MAX PRESS" figure molded into the tire is the ceiling the tire can safely hold, not what your vehicle needs. Follow the door placard even if you switch to a different tire brand or model.