Lexus ES300 Owner's Manual page 306

MAINTENANCE
Power steering fluid level
Check the level through the reservoir. The level should be in
the "HOT" or "COLD" range depending on the fluid
temperature. See page 323 for additional information.
Exhaust system
If you notice any change in the sound of the exhaust or smell
exhaust fumes, have the cause located and corrected
immediately. (See "Engine exhaust caution" on page 223.)
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DOES YOUR VEHICLE NEED
REPAIRING?
Be on the alert for changes in performance and sounds, and
visual tip offs that indicate service is needed. Some important
clues are:
D Engine missing, stumbling, or pinging
D Appreciable loss of power
D Strange engine noises
D A fluid leak under the vehicle (However, water dripping from
the air conditioning after use is normal.)
D Change in exhaust sound (This may indicate a dangerous
carbon monoxide leak. Drive with the windows open and
have the exhaust system checked immediately.)
D Flat looking tires, excessive tire squeal when cornering,
uneven tire wear
D Vehicle pulls to one side when driving straight on a level
road
D Strange noises related to suspension movement
D Loss of brake effectiveness, spongy feeling brake pedal,
pedal almost touches floors, vehicle pulls to one side when
braking
D Engine coolant temperature continually higher than normal