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In the United States, the United States Department Of Transportation (NHTSA) released the FMVSS No. 138, which requires an installation of a Tire Pressure Monitoring System to all new passenger cars, multipurpose passenger vehicles, trucks, and buses that have a gross vehicle weight rating (GVWR) of 4,536 kg (10,000 lbs.) or less, except those vehicles with dual wheels on an axle, as of 2007.
You can take them out, but it's basically the same principle as a cat, federal law says no.
Yeah, its a Liberty thing. Mine does it when all my tires are at 35, give or take a little. Just do your best to ignore it. Especially if none of them are giving you any problems or concerns..