Toyota 2014 Prius Owner's Manual page 411

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Reset the maintenance data (U.S.A. only)
After the required maintenance is performed according to the maintenance
schedule, please reset the maintenance data.
To reset the data, follow the procedures described below:
STEP 1 Turn the "POWER" switch off with the trip meter A shown.
STEP 2
Turn the "POWER" switch to ON mode with the MPH or km/h button
(→P. 218) held down.
Keep pressing the button until the trip meter indicates "000000" and
STEP 3
the multi-information display indicates that the reset is complete.
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Allow inspection and repairs to be performed by a Toyota dealer
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Toyota technicians are well-trained specialists and are kept up to date
with the latest service information. They are well informed about the
operation of all systems on your vehicle.
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Keep a copy of the repair order. It proves that the maintenance that has
been performed is under warranty coverage. If any problem should arise
while your vehicle is under warranty, your Toyota dealer will promptly
take care of it.
4-2. Maintenance
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