Toyota Camry: The tire pressure warning light may come on due to natural causes 
(vehicles with a tire pressure warning system) - If a warning light turns on or a warning buzzer sounds... - Steps to take in an emergency - When trouble arises - Toyota Camry Owners ManualToyota Camry: The tire pressure warning light may come on due to natural causes (vehicles with a tire pressure warning system)

The tire pressure warning light may come on due to natural causes such as natural air leaks and tire inflation pressure changes caused by temperature.

In this case, adjusting the tire inflation pressure will turn off the warning light (after a few minutes).

    When the tire pressure warning light comes on (if equipped)
    Check the tire inflation pressure and adjust to the appropriate level. Pushing the tire pressure warning reset switch will not turn off the tire pressure warning light. ...

    When a tire is replaced with a spare tire (vehicles with a tire pressure warning system)
    The compact spare tire is not equipped with a tire pressure warning valve and transmitter. If a tire goes flat, the tire pressure warning light will not turn off even though the flat tire has been ...

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