2018 Lexus ES300h check engine

452
ES300h_OM_OM33D45U_(U)7-3. Do-it-yourself maintenance
WARNING
■Used engine oil
●Used engine oil contains potentially harm
ful contaminants which may cause skin dis-
orders such as inflammation and skin cance r, so care should be taken to avoid pro-
longed 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 sa fe and acceptable manner. Do not dispose of
used oil and filters in household tras h, in sewers or onto the ground.
Call your Lexus dealer, service station or auto parts store for information concerning
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 fille r cap is properly tightened.

ES300h_OM_OM33D45U_(U)
4537-3. Do-it-yourself maintenance
7
Maintenance and care
The coolant level is satisfactory if it is between the “FULL” and “LOW” lines on
the reservoir when the hybrid system is cold.
■Engine coolant reservoir
Reservoir cap
“FULL” line
“LOW” line
If the level is on or below the “LOW”
line, add coolant up to the “FULL”
line. ( →P. 531)
■Power control unit coolant reservoir
Reservoir cap
“FULL” line
“LOW” line
If the level is on or below the “LOW”
line, add coolant up to the “FULL”
line. ( →P. 531)
■Coolant selection
Only use “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.
U.S.A.:
“Toyota Super Long Life Coolant” is a mixt ure of 50% coolant and 50% deionized water.
(Minimum temperature: -31 °F [-35 °C])
Canada:
“Toyota Super Long Life Cool ant” is a mixture of 55% coolant and 45% deionized water.
(Minimum temperature: -44° F [-42°C])
For more details about coolant, contact your Lexus dealer.
■If the coolant level drops within a short time of replenishing
Visually check the radiator, hoses, engine c oolant reservoir cap, power control unit cool-
ant reservoir cap, drain cock and water pump.
If you cannot find a leak, have your Lexus de aler test the cap and check for leaks in the
cooling system.
Coolant
1
2
3
1
2
3

454
ES300h_OM_OM33D45U_(U)7-3. Do-it-yourself maintenance
Check the radiator and condenser an
d clear away any foreign objects.
If either of the above parts is extremely dirty or you are not sure of their condi-
tion, have your vehicle inspected by your Lexus dealer.
WARNING
■When the hybrid system is hot
Do not remove the engine coolant reservoi r cap, power control unit coolant reservoir
cap, or 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 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 cool-
ing. Be sure to read the antifreeze or coolant label.
■If you spill coolant
Be sure to wash it off with water to prevent it from damaging parts or paint.
Radiator and condenser
WARNING
■When the hybrid system is hot
Do not touch the radiator or condenser as they may be hot and cause serious injuries,
such as burns.

480
ES300h_OM_OM33D45U_(U)7-3. Do-it-yourself maintenance
Checking and replacing fuses
Turn the power switch off.
Open the Fuse box cover.
If any of the electrical components do not operate, a fuse may have blown. If
this happens, check and repl
ace the fuses as necessary.
1
2
Engine compartment (right side)Engine compartment (left side)
Push the tab in and lift the lid off. Push the tab in and lift the lid off.
Driver’s side instrument panel
Remove the lid.

483
ES300h_OM_OM33D45U_(U)7-3. Do-it-yourself maintenance
7
Maintenance and care
Light bulbs
Check the wattage of the light bulb to be replaced. (
→P. 546)
→ P. 448
■Front
Front side marker light
Headlight high beam (halogen bulb)
Front turn signal light
You may replace the following bulbs by yo urself. The difficulty level of replace-
ment varies depending on the bulb. If necessary bulb replacement seems diffi-
cult to perform, contact your Lexus dealer.
For more information about replacing other light bulbs, contact your Lexus
dealer.
Preparing for light bulb replacement
Removing the engine compartment cover
Bulb locations
1
2
3

5118-2. Steps to take in an emergency
ES300h_OM_OM33D45U_(U)
8
When trouble arises
■If “Maintenance Required Visit Your Dealer” is shown (U.S.A. only)
Indicates that all maintenance is required to correspond to the driven distance on the
maintenance schedule
*.
Comes on approximately 5000 miles (8000 km) after the message has been reset.
(The indicator will not work properly unless the message has been reset.)
Perform the necessary maintenance. Please reset the message after the maintenance is
performed (→ P. 437)
*: Refer to the separate “Scheduled Maintena nce” or “Owner’s Manual Supplement” for
the maintenance interval applicable to your vehicle.
■If “Oil Maintenance Required Soon” is shown
Indicates that the engine oil is scheduled to be changed. (The indicator will not work
properly unless the oil mainte nance data has been reset.)
Check the engine oil, and change if necessary. After changing the engine oil, the oil
change system should be reset. ( →P. 451)
■If “Oil Maintenance Required” is shown
Indicates that the engine oil should be changed. (After the engine oil is changed and the
oil maintenance data has been reset.)
Check and change the engine o il, and oil filter by your Lexus dealer. After changing the
engine oil, the oil change system should be reset. (→ P. 451)
■If “Power Turned Off to Save Battery” is shown
Power was turned off due to the automatic power off function.
Next time when starting the hybrid system, operate the hybrid system for approximately
5 minutes to recharge the 12-volt battery.
■If “Forward Camera System Unavailable” or “Forward Camera System Unavailable
Clean Windshield” is displayed.
The following systems may be suspended until the problem shown in the message is
resolved. ( →P. 215, 503)
●PCS (Pre-Collision System)
●LDA (Lane Departure Alert with steering control)
●Dynamic radar cruise control
●Automatic High Beam
■When a message that indicates the need for the shift lever operation is shown
To prevent the shift lever from being operat ed incorrectly or the vehicle from moving
unexpectedly, a message that re quires shifting the shift lever may be shown on the multi-
information display. In that case, follow the instruction of the message and shift the shift
lever.
■If “Visit Your Dealer” is shown
The system or part shown on the multi-info rmation display is malfunctioning. Have the
vehicle inspected by your Lexus dealer immediately.

5128-2. Steps to take in an emergency
ES300h_OM_OM33D45U_(U)
■If “See Owner’s Manual” is shown
●If the following message is shown, following the instructions, accordingly.
• “Engine Coolant Temp High” ( →P. 531)
●If the following messages are sh own, there may be a malfunction.
Immediately have the vehicle inspected by your Lexus dealer.
• “Check Access System with Elec. Key”
• “Hybrid System Malfunction”
●If the following messages are sh own, there may be a malfunction.
Immediately stop the vehicle in a safe place and contact your Lexus dealer. Continuing
to drive the vehicle may be dangerous.
• “Braking Power Low Stop in a Safe Place”
• “Charging System Malfunction”
• “Oil Pressure Low Stop in a Safe Place”
■Warning buzzer
In some cases, the buzzer may not be heard because of noisy place or an audio sound.

5348-2. Steps to take in an emergency
ES300h_OM_OM33D45U_(U)
WARNING
■When inspecting under the hood of your vehicle
Observe the following precautions.
Failure to do so may result in serious injury such as burns.
●If steam is seen coming from under the h ood, do not open the hood until the steam
has subsided. The engine compartment may be very hot.
●After the hybrid system has been turned off, check that the indicator on the power
switch and the “READY” indicator are off.
When the hybrid system is operating, the gasoline engine may automatically start, or
the cooling fan may suddenly operate even if the gasoline engine stops. Do not touch
or approach rotating parts such as the fan, which may lead to fingers or clothing
(especially a tie, a scarf or a muffler) ge tting caught, resulting in serious injury.
●Do not loosen the radiator cap or the c oolant reservoir cap while the hybrid system
and radiator are hot. High temperature steam or coolant could spray out.
NOTICE
■When adding engine/power control unit coolant
Add coolant slowly after the hybrid system has cooled down sufficiently. Adding cool
coolant to a hot hybrid system too quickly can cause damage to the hybrid system.
■To prevent damage to the cooling system
Observe the following precautions:
●Avoid contaminating the coolant with foreig n matter (such as sand or dust etc.).
●Do not use any coolant additive.