2020 LEXUS NX300 Owners Manual

3296-2. Maintenance
LEXUS NX300 Owners Manual_USA_M78389_en
6
Maintenance and care
SeatsDo the seat controls
operate properly?
Steering wheel
• Does the steering
wheel rotate
smoothly?
• Does the steering wheel have the cor-
rect amount of free
play?
•There should not be any strange sounds
coming from the
steering wheel.
Vehicle exterior
ItemsCheck points
DoorsDo the doors operate
smoothly?
Engine hood
Does the engine hood
lock system work prop-
erly?
Fluid leaks
There should not be any
signs of fluid leakage
after the vehicle has
been parked.
ItemsCheck points
Tires
• Is the tire inflation pressure correct?
• The tires should not be damaged or exces-
sively worn.
• Have the tires been rotated according to
the maintenance
schedule?
• The wheel nuts should not be loose.
Windshield wip-
ers/rear win-
dow wiper
• The wiper blades should not show any
signs of cracking,
splitting, wear, con-
tamination or defor-
mation.
• The wiper blades should clear the wind-
shield/rear window
without streaking or
skipping.
ItemsCheck points

3306-2. Maintenance
LEXUS NX300 Owners Manual_USA_M78389_en
The OBD system determines that a
problem exists somewhere in the emis-
sion control system. Your vehicle may
not pass the I/M test and may need to
be repaired. Contact your Lexus
dealer to service the vehicle.
When the battery is disconnected
or discharged
Readiness codes that are set during
ordinary driving are erased.
Also, depending on your driving
habits, the readiness codes may not
be completely set.
 When the fuel tank cap is loose
The malfunction indicator lamp
comes on indicating a temporary
malfunction and your vehicle may
not pass the I/M test. The error code in the OBD system will
not be cleared unless the vehicle is
driven 40 or more times.
Contact your Lexus dealer to prepare
the vehicle for re-testing.
Emission inspection and
maintenance (I/M) pro-
grams
Some states have vehicle emission
inspection programs which include
OBD (On Board Diagnostics)
checks. The OBD system monitors
the operation of the emission con-
trol system.
If the malfunction indicator lamp
comes on
Your vehicle may not pass the
I/M test in the following situa-
tions:
When the malfunction indicator
lamp still remains on after sev-
eral driving trips
If your vehicle does not pass the
I/M test

3316-3. Do-it-yourself maintenance
LEXUS NX300 Owners Manual_USA_M78389_en
6
Maintenance and care
6-3.Do-it-yourself maintenance
Do-it-yourself service pre-
cautions
If you perform maintenance by
yourself, be sure to follow the cor-
rect procedure as given in these
sections.
Maintenance
ItemsParts and tools
Battery condi-
tion (P.340)
•Warm water
• Baking soda
•Grease
• Conventional wrench
(for terminal clamp
bolts)
Brake fluid level
( P.340)
•FMVSS No.116 DOT
3 or SAE J1703;
FMVSS No.116 DOT
4 or SAE J1704 brake
fluid
• Rag or paper towel
• Funnel (used only for adding brake fluid)
Engine/inter-
cooler coolant
level ( P.338)
•“Toyota Super Long
Life Coolant” or a sim-
ilar high quality eth-
ylene glycol-based
non-silicate, non-
amine, non-nitrite and
non-borate coolant
with long-life hybrid
organic acid technol-
ogy
For the U.S.A.:
“Toyota Super Long
Life Coolant” is pre-
mixed with 50% cool-
ant and 50% deion-
ized water.
For Canada:
“Toyota Super Long
Life Coolant” is pre-
mixed with 55% cool-
ant and 45% deion-
ized water.
• Funnel (used only for adding coolant)
Engine oil level
( P.336)
•“Toyota Genuine
Motor Oil” or equiva-
lent
• Rag or paper towel
• Funnel (used only for adding engine oil)
Fuses
( P.358)Fuse with same amper-
age rating as original
Light bulbs
( P.361)Bulb with same number
and wattage rating as
original
Headlight aimPhillips-head screw-
driver
Radiator and
condenser
( P.339)
—
ItemsParts and tools

3326-3. Do-it-yourself maintenance
LEXUS NX300 Owners Manual_USA_M78389_en
Tire inflation
pressure
( P.351)• Tire pressure gauge
• Compressed air
source
Washer fluid
( P.342)
• Water or washer fluid
containing antifreeze
(for winter use)
• Funnel (used only for adding water or
washer fluid)
WARNING
The engine compartment contains many
mechanisms and fluids that may move
suddenly, become hot, or become elec-
trically energized. To avoid death or seri-
ous injury, observe the following
precautions.
■When working on the engine com-
partment
●Keep hands, clothi ng and tools away
from the moving fan and engine drive
belt.
●Be careful not to touch the engine,
radiator, exhaust manifold, etc. right
after driving as they may be hot. Oil
and other fluids may also be hot.
●Do not leave anything that may burn
easily, such as paper and rags, in the
engine compartment.
●Do not smoke, cause sparks or expose
an open flame to fuel or the battery.
Fuel and battery fumes are flammable.
●Be extremely cautions when working
on the battery. It contains poisonous
and corrosive sulfuric acid.
ItemsParts and tools■When working near the electric cool-
ing fans or radiator grille
Be sure the engine switch is off.
With the engine switch in IGNITION
ON mode, the electric cooling fans may
automatically start to run if the air condi-
tioning is on and/or the coolant tempera-
ture is high. ( P.339)
■Safety glasses
Wear safety glasses to prevent flying or
falling material, fluid spray, etc. from get-
ting in your eyes.
NOTICE
■If you remove the air cleaner filter
Driving with the air cleaner filter
removed may cause excessive engine
wear due to dirt in the air.

3336-3. Do-it-yourself maintenance
LEXUS NX300 Owners Manual_USA_M78389_en
6
Maintenance and care
1Pull the hood lock release lever.
The hood will pop up slightly.
2Pull up the auxiliary catch lever and
lift the hood.■Front
Hood
Opening the hood
WARNING
■Pre-driving check
Check that the hood is fully closed and
locked.
If the hood is not locked properly, it may
open while the vehicle is in motion and
cause an accident, which may result in
death or serious injury.
Positioning a floor jack
When using a floor jack, follow the
instructions in the manual provided
with the jack and perform the oper-
ation safely.
When raising your vehicle with a
floor jack, position the jack cor-
rectly.
Improper placement may damage
your vehicle or cause injury.
Location of the jack point

3346-3. Do-it-yourself maintenance
LEXUS NX300 Owners Manual_USA_M78389_en
■Rear
1 Remove the bolt and then
remove the cover .
2 Rise your vehicle with a floor jack.
A
B

3356-3. Do-it-yourself maintenance
LEXUS NX300 Owners Manual_USA_M78389_en
6
Maintenance and care
Fuse box (P.358)
Engine coolant reservoir ( P.338)
Engine oil filler cap ( P.336)
Engine oil level dipstick ( P.336)
Intercooler coolant reservoir ( P.338)
Battery ( P.340)
Brake fluid reservoir ( P.340)
Radiator ( P.339)
Condenser ( P.339)
Electric cooling fans
Washer fluid tank ( P.342)
Engine compartment
Components
A
B
C
D
E
F
G
H
I
J
K

3366-3. Do-it-yourself maintenance
LEXUS NX300 Owners Manual_USA_M78389_en
■Removing the engine compart-
ment cover
■Installing the clips
1
Insert
2
Press With the engine at operating tempera-
ture and turned off, check the oil level
on the dipstick.
■Checking the engine oil
1
Park the vehicle on level ground.
After warming up the engine and
turning off the engine, wait more
than 5 minutes for the oil to drain
back into the bottom of the engine.
2
Holding a rag under the end, pull
the dipstick out.
3
Wipe the dipstick clean.
4
Reinsert the dipstick fully with its
protruding areas ( in the illustra-
tion) pointing towards engine.
Engine compartment cover
NOTICE
■After installing an engine compart-
ment cover
Make sure that the cover is securely
installed in its original position.
Checking and adding the engine
oil
A