Toyota Tacoma 2018 Owner's Manual page 558

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8-1. Essential information
WARNING
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If the engine has to be turned off while driving
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Power assist for the brakes and steering wheel will be lost, making the
brake pedal harder to depress and the steering wheel heavier to turn.
Decelerate as much as possible before turning off the engine.
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Vehicles without a smart key system:
Never attempt to remove the key, as doing so will lock the steering wheel.