Toyota 2009 Yaris Hatchback Owner's Manual page 270

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Installing tire pressure warning valves and transmitters
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 tire pressure warning valve and transmitter ID codes must be regis-
tered in the tire pressure warning computer and tire pressure warning
system must be initialized. Have tire pressure warning valve and trans-
mitter ID codes registered by your Toyota dealer.
Registering ID codes
The tire pressure warning valve and transmitter is equipped with a
unique ID code. When replacing a tire pressure warning valve and
transmitter, it is necessary to register the ID code of tire pressure
warning valve and transmitter. Have the ID code registered by your
Toyota dealer.
When to replace your vehicle's tires
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Tires should be replaced if:
You have tire damage such as cuts, splits, cracks deep enough to
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expose the fabric or bulges indicating internal damage
A tire goes flat repeatedly or cannot be properly repaired due to the
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size or location of a cut or other damage
If you are not sure, consult with your Toyota dealer.
Replacing tires and wheels
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If the ID code of the tire pressure warning valve and transmitter is not
registered, the tire pressure warning system will not work properly. After
driving for about 20 minutes, the tire pressure warning light comes on
after blinking for 1 minute to indicate a system malfunction.
Tire life
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Any tire over 6 years old must be checked by a qualified technician even
if they have seldom or never been used or damage is not obvious.
4-3. Do-it-yourself maintenance
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