Toyota Prius Owner's Manual page 437

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Tire pressure warning system (if equipped)
Your vehicle is equipped with a tire pressure warning system
that uses tire pressure warning valves and transmitters to detect
low tire inflation pressure before serious problems arise.
(P. 504)
Vehicles with the compact spare tire: The compact spare tire is
not equipped with a tire pressure warning valve and transmitter.
Installing tire pressure warning valves and transmitters (vehicles
with the tire pressure warning system)
When replacing tires or wheels, tire pressure warning valves and
transmitters must also be installed.
When new tire pressure warning valves and transmitters are
installed, new ID codes must be registered in the tire pressure warn-
ing computer and the tire pressure warning system must be initial-
ized. Have tire pressure warning valve and transmitter ID codes
registered by any authorized Toyota dealer or repairer, or another
duly qualified and equipped professional. (P. 439)
PRIUS_OM_OM47A19E_(EE)
4-3. Do-it-yourself maintenance
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