2015 LEXUS RX350 check engine

6624-2. Maintenance
Vehicle exterior Items Check points
Doors • Do the doors operate smoothly?
Engine hood • Does the engine hood lock system
work properly?
Fluid leaks • There should not be any signs of
fluid leakage after the vehicle has
been parked.
Ti r e s • Is the tire inflation pressure cor-
rect?
• The tires should not be damaged or
excessively worn.
• Have the tires been rotated
according to the maintenance
schedule?
• The wheel nuts should not be loose.
Windshield wipers/rear window
wiper • The wiper blades should not show
any signs of cracking, splitting,
wear, contamination or deforma-
tion.
• The wiper blades should clear the
windshield/rear window without
streaking or skipping.
CAUTION
■
If the engine is running
Turn the engine off and ensure that there is adequate ventilation before performing
maintenance checks.

6744-3. Do-it-yourself maintenance
Engine oil
With the engine at operating temperat ure and turned off, check the oil
level on the dipstick.
■ Checking the engine oil
Park the vehicle on level grou nd. After warming up the engine
and turning it off, wait more th an 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.STEP 1
STEP 2
STEP 3
STEP 4
STEP 5
STEP 6

6754-3. Do-it-yourself maintenance
4
Maintenance and care ■ Adding engine oil
If the oil level is below or near the
low level mark, add engine oil of
the same type as th at already in the
engine.
Make sure to check th e oil type and prepare the items needed before
adding oil.
Remove the oil filler cap by turning it counterclockwise.
Add engine oil slowly, checking the dipstick.
Install the oil filler cap by turning it clockwise.Engine oil
selection  P. 8 0 9
Oil quantity
(Low  Full) 1.6 qt. (1.5 L, 1.3 Imp. qt.)
Items Clean funnel
■
Engine oil consumption
A certain amount of engine oil will be consumed while driving. In the following situ-
ations, oil consumption may increase, and engine oil may need to be refilled in
between oil maintenance intervals.
●
When the engine is new, for example di rectly 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 engi ne speeds or with a heavy load, when towing, or when
driving while accelerating or decelerating frequently
●
When leaving the engine id ling for a long time, or when driving frequently
through heavy traffic STEP 1
STEP 2
STEP 3

6764-3. Do-it-yourself maintenance
CAUTION■
Used engine oil ●
Used engine oil contains potentially harmful contaminants which may cause skin
disorders such as inflammati on or skin cancer, so care should be taken to avoid
prolonged and repeated contact. To remove used engine oil from your skin, wash
thoroughly with soap and water.●
Dispose of used oil and filters only in a safe and acceptable manner. Do not dis-
pose of used oil and filters in househol d trash, in sewers or onto the ground.
Call your Lexus dealer, service station or auto parts store for information con-
cerning recycling or disposal.●
Do not leave used engine oil within the reach of children.
NOTICE■
To prevent serious engine damage
Check the oil level on a regular basis.■
When replacing the engine oil ●
Be careful not to spill engine oil on the vehicle components.●
Avoid overfilling, or the engine could be damaged.●
Check the oil level on the dipstick every time you refill the vehicle.●
Be sure the engine oil filler cap is properly tightened.

6784-3. Do-it-yourself maintenance
Radiator and condenser
Check the radiator and condenser an d clear away any foreign objects.
If either of the above parts are extremely dirty or you are not sure of their
condition, have your vehicle checked by your Lexus dealer.■
If the coolant level drops within a short time after replenishing
Visually check the radiator, hoses, radiator cap, drain cock and water pump.
If you cannot find a leak, have your Lexus dealer test the cap and check for leaks in
the cooling systems.
CAUTION■
When the engine is hot
Do not remove the radiator cap.
The cooling system may be under pressure and may spray hot coolant if the cap is
removed, causing serious injuries, such as burns.
NOTICE■
When adding engine coolant
Coolant is neither plain water nor straight antifreeze. The correct mixture of water
and antifreeze must be used to provide proper lubrication, corrosion protection
and cooling. Be sure to read the antifreeze or coolant label.■
If you spill coolant
Be sure to wash it off with water to prevent damage to parts or paint.
CAUTION
■
When the engine is hot
Do not touch the radiator or condenser as they may be hot and cause serious inju-
ries, such as burns.

6814-3. Do-it-yourself maintenance
4
Maintenance and care Battery
Check the battery as follows.
■ Battery exterior
Make sure that the battery terminals are not corroded and that there
are no loose connections, cracks, or loose clamps.
Terminals
Hold-down clamp
■
Before recharging
When recharging, the battery produces hydrogen gas which is flammable and
explosive. Therefore, observe the following before recharging: ●
If recharging with the battery installed on the vehicle, be sure to disconnect the
ground cable.●
Make sure the power switch on the charger is off when connecting and discon-
necting the charger cables to the battery.■
After recharging/reconnecting the battery
In some cases, the engine may not start. Follow the procedure below to initialize the
system.
Shift the shift lever to P, and turn the “ENGINE START STOP” switch off.
Open and close any of the doors.
Start the engine. (If the engine does not start first time, repeat the proce-
dure.)
If the engine will not start even after mult iple attempts at the above method, contact
your Lexus dealer. STEP 1
STEP 2
STEP 3

7034-3. Do-it-yourself maintenance
4
Maintenance and care Checking and replacing fuses If any of the electrical components do not operate, a fuse may have blown.
If this happens, check and re place the fuses as necessary.
Turn the “ENGINE START STOP” switch off.
After a system failure, see “Fuse layout and amperage ratings”
for details about which fuse to check. (  P. 7 0 6 )
Remove the engine compartment cover. (  P. 671)
Open the fuse box cover.
Engine compartment
Push the tab in and lift the lid off.
Driver's side instrument panel
Remove the lid.STEP 1
STEP 2
STEP 3
STEP 4

7164-3. Do-it-yourself maintenance
Headlight aim ■ Removing the engine compartment cover
 P. 6 7 1
■ Vertical movement adjusting bolts
Vehicles with halogen headlights
Adjustment bolt A
Adjustment bolt B
Vehicles with discharge headlights
Adjustment bolt A
Adjustment bolt B
■ Before checking the headlight aim
Make sure the vehicle has a full tank of gas and the area around
the headlight is not deformed.
Park the vehicle on level ground.
Sit in the driver’s seat.
Bounce the vehicle several times.STEP 1
STEP 2
STEP 3
STEP 4