Lexus IS220d 2012 Manual page 561

5-2. Steps to take in an emergency
CAUTION

If the engine has to be turned off while driving
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.
5
535
IS250/220d/200d_EE