2016 LEXUS RX450H maintenance

470 6-2. Maintenance
RX450h_U_OM0E013U The OBD system determines that a problem exists somewhere in the emission
control system. Your vehicle may not pa ss the I/M test and may need to be
repaired. Contact your Lexus dealer to service the vehicle. ●
When the 12-volt 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 com-
pletely 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) programsSome states have vehicle emission inspection programs which include OBD
(On Board Diagnostics) checks. The OBD system monitors the operation of
the emission control system.
If the malfunction indicator lamp comes on
Your vehicle may not pass the I/M test in the following situations:
When the malfunction indicator lamp s till remains on af ter several driv-
ing trips
If your vehicle does not pass the I/M test

471
RX450h_U_OM0E013U 6
Maintenance and care 6-3. Do-it-yourself maintenance
Do-it-yourself service precautions If you perform maintenance by yourself, be sure to follow the correct proce-
dure as given in these sections. Items Pa r t s a n d t o o l s
12-volt battery con-
dition (  P. 4 8 3 ) •Grease
• Conventional wrench (for terminal clamp bolts)
Brake fluid level
(  P. 4 8 1 ) • FMVSS No.116 DOT 3 or SAE J1703 brake fluid
• Rag or paper towel
• Funnel (used only for adding brake fluid)
Engine/power con-
trol unit coolant level
(  P. 4 7 9 ) • “Toyota Super Long Life Coolant” or a similar high quality
ethylene glycol-based non-silicate, non-amine, non-nitrite
and non-borate coolant with long-life hybrid organic acid
technology
For the U.S.A.:
“Toyota Super Long Life Coolant” is pre-mixed with 50%
coolant and 50% deionized water.
For Canada:
“Toyota Super Long Life Coolant” is pre-mixed with 55%
coolant and 45% deionized water.
• Funnel (used only for adding coolant)
Engine oil level
(  P. 4 76 ) • “Toyota Genuine Motor Oil” or equivalent
• Rag or paper towel
• Funnel (used only for adding engine oil)
Fuses (  P. 5 0 8 ) • Fuse with same amperage rating as original
Headlight aim
*
(  P. 511) • Phillips-head screwdriver
Light bulbs
(  P. 5 1 3 ) • Bulb with same number and wattage rating as original
•Flathead screwdriver •Wrench
Radiator and con-
denser (  P. 4 8 0 ) 
Tire inflation pres-
sure (  P. 4 9 6 ) • Tire pressure gauge • Compressed air source

472 6-3. Do-it-yourself maintenance
RX450h_U_OM0E013U * : Vehicles with sing le-beam headlightsWa s h e r f l u i d
(  P. 4 8 2 ) • Water or washer fluid containi ng antifreeze (for winter use)
• Funnel (used only for adding water or washer fluid)
WA R N I N G
The engine compartment contains many mechanisms and fluids that may move suddenly,
become hot, or become electrically energized. To avoid death or serious injury, observe
the following precautions. ■
When working on the engine compartment ●
Make sure that the indicator on the power switch and the “READY” indicator are
both off. ●
Keep hands, clothing and tools away from the moving fan and engine drive belt.●
Be careful not to touch the engine, power control unit, 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. Fuel fumes are flamma-
ble. ■
When working near the electric cooling fans or radiator grille
Be sure the power switch is off.
With the power switch in ON mode, the electric cooling fans may automatically start to
run if the air conditioning is on and/or the coolant temperature is high. (  P. 4 8 0 )■
Safety glasses
Wear safety glasses to prevent flying or fallin g material, fluid spray, etc. from getting 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. Items Pa r t s a n d t o o l s

4736-3. Do-it-yourself maintenance
6
Maintenance and care
RX450h_U_OM0E013U Pull the hood lock release lever. The hood will pop up slightly.
Pull up the auxiliary catch lever and
lift the hood.Hood Release the lock from the inside of the vehicle to open the hood. 1
2
WA R N I N G ■
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.

474 6-3. Do-it-yourself maintenance
RX450h_U_OM0E013U ◆ Front
◆ RearPositioning a floor jack When using a floor jack, follow the instructions in the manual provided with
the jack and perform the operation safely.
When raising your vehicle with a floor jack, position the jack correctly.
Improper placement may damage your vehicle or cause injury.

4756-3. Do-it-yourself maintenance
6
Maintenance and care
RX450h_U_OM0E013U ■
12-volt battery
 P. 4 8 3Engine compartment
Wa s h e r f l u i d t a n k (  P. 4 8 2 )
Brake fluid reservoir (  P. 4 8 1 )
Engine oil level dipstick
(  P. 4 76 )
Engine coolant reservoir
(  P. 4 7 9 )
Power control unit coolant reservoir
(  P. 4 7 9 ) Fuse boxes (  P. 5 0 8 )
Radiator (  P. 4 8 0 )
Power control unit coolant
radiator (  P. 4 8 0 )
Condenser (  P. 4 8 0 )
Electric cooling fans
Engine oil filler cap (  P. 4 7 7 )1
2
3
4
5 6
7
8
9
10
11

476 6-3. Do-it-yourself maintenance
RX450h_U_OM0E013U With the engine at operating temperatur e and turned off, check the oil level on
the dipstick. ■
Checking the engine oil
Park the vehicle on level ground. After warming up the engine and turning
off the hybrid system, wait more than 5 minutes for the oil to drain back into
the bottom of the engine.
Holding a rag under the end, pull
the dipstick out.
Wipe the dipstick clean.
Reinsert the dipstick fully.
Holding a rag under the end, pull
the dipstick out and check the oil
level.
Low
Normal
Excessive
The shape of the dipstick may dif-
fer depending on the type of vehi-
cle or engine.
Wipe the dipstick and reinsert it fully.Engine oil 1
2
3
4
5
1
2
3
6

4776-3. Do-it-yourself maintenance
6
Maintenance and care
RX450h_U_OM0E013U ■
Adding engine oil
If the oil level is below or near the
low level mark, add engine oil of the
same type as that already in the
engine.
Make sure to check the oil type and prepare the items needed before adding
oil.
Remove the oil filler cap by turning it coun terclockwise.
Add engine oil slowly, checking the dipstick.
Install the oil filler cap by turning it clockwise. ■
Engine oil consumption
A certain amount of engine oil will be consum ed while driving. In th e following situations,
oil consumption may increase, and engine o il may need to be refilled in between oil
maintenance intervals. ●
When the engine is new, for example directly after purchasing the vehicle or after
replacing the engine ●
If low quality oil or oil of an inappropriate viscosity is used●
When driving at high engine speeds or with a heavy load, when towing, or when driving
while accelerating or de celerating frequently●
When leaving the engi ne idling for a long time, or when driving frequently through
heavy trafficEngine oil selection  P. 5 8 6
Oil quantity (Low  Full) 1.9 qt. (1.8 L, 1.6 Imp. qt.)
Items Clean funnel1
2
3