Lexus LS 600h L 2012 Owner's Manual page 471

4-3. Do-it-yourself maintenance
NOTICE
When inspecting and adjusting tire inflation pressure
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Be sure to reinstall the tire valve caps.
Without the valve caps, dirt or moisture could get into the valve and cause air leak-
age, which could result in an accident. If the caps have been lost, replace them as
soon as possible.
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