Standard 138: Tire Pressure Monitoring Systems
Scope and Purpose:
This standard specifies performance requirements for tire pressure-monitoring systems. The purpose of this standard is to prevent significant under-inflation of tires and the resulting safety problems.
Application:
Passenger cars, multipurpose passenger vehicles, trucks, and buses that have a GVWR of 4,536 kg (10,000 lb) or less, except those vehicles with dual wheels on an axle

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