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    Why Does My Tire Keep Losing Air?

    Typical repair cost: $5–$350

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    Common Symptoms

    TPMS warning
    Visible flatness
    Slow leak over days
    Hissing at the valve
    Wheel vibration

    Most Likely Causes

    1

    Nail or screw puncture

    Repair if in tread area and under 1/4 inch.

    2

    Leaking valve stem / core

    Cheap fix — often overlooked.

    3

    Bead leak from corrosion

    Common on aluminum wheels; cleaned and resealed.

    4

    Cracked wheel

    Pothole damage; usually requires wheel replacement.

    5

    Temperature change

    Tires lose ~1 PSI per 10°F drop — winter is not always a leak.

    How a Shop Diagnoses It

    1. 1.Soapy-water test at tread, bead, valve, and around wheel.
    2. 2.Dunk in water tank for slow leaks.
    3. 3.Inspect valve core with tool; replace if leaking.

    When to see a professional

    If air pressure drops below 25 PSI, do not drive — sidewall damage and blowout risk.

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