2018 Lexus GS450h check engine light

4287-2. Steps to take in an emergency
GS450h_OM_OM30G62U_(U)
Indicates a malfunction in the brake override systemA buzzer also sounds.
→ Have the vehicle inspecte d by your Lexus dealer
immediately.
Indicates that engine oil level is low
This message may ap pear if the vehicle is stopped on a
slope. Move the vehicle to a level surface and check to
see if the message disappears.
A buzzer also sounds.
→ Check the level of engine oil, and add if necessary.
Indicates that the hybrid system has overheated
This message may be disp layed when driving under
severe operating conditions. (For example, when driv-
ing up a long steep hill.)
A buzzer also sounds.
→ Stop and check. ( →P. 461)
Indicates a malfunction in:
• The Automatic High Beam system (if equipped);
• The AFS (Adaptive Front-lighting System) (if equipped); or
• The LED headlight system
A buzzer also sounds.
→ Have the vehicle inspected by your Lexus dealer.
Warning messageDetails/Actions
(Flashes)

4317-2. Steps to take in an emergency
GS450h_OM_OM30G62U_(U)
7
When trouble arises
*: Refer to the separate “Scheduled Maintenance” or “Owner’s Manual Supplement”
for the maintenance interval applicable to your vehicle.
(U.S.A. only)
Indicates that all maintenance according to the driven
distance on the maintenance schedule
* should be per-
formed soon.
Comes on approximately 4500 miles (7200 km)
after the message has been reset.
→ If necessary, perform maintenance.
Indicates that the engine o il and oil filter should be
changed
→ Have the engine oil and oil filter checked and/or
changed by your Lexus dealer. After changing the
engine oil, the oil change system should be reset.
( → P. 355)
(U.S.A. only)
Indicates that all maintenanc e 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 message will
not display properly unless the message has been
reset.)
→ Perform the necessary maintenance. Please reset
the message after the maintenance is performed.
(→ P. 344)
(If equipped)
Indicates that the Automati c High Beam switch was
pressed while the low beams were on
→ Turn the high beam headlights on before pressing
the Automatic High Beam switch.
(If equipped)
Indicates that, since the VSC (Vehicle Stability Control)
system was turned off, the pre-collision braking and pre-
collision brake assist are stopped (The pre-collision
warning function will be operational)
→ Turn the VSC on. ( →P. 271)
Warning messageDetails/Actions

4487-2. Steps to take in an emergency
GS450h_OM_OM30G62U_(U)
Firmly tighten each wheel nut two or
three times in the order shown in the
illustration.
Tightening torque:
76 ft•lbf (103 N•m, 10.5 kgf•m)
Stow the flat tire, tire jack and all tools.
■The compact spare tire
●The compact spare tire is identified by the label “TEMPORARY USE ONLY” on the
tire sidewall.
●Use the compact spare tire temporarily, and only in an emergency.
●Make sure to check the tire inflation pressure of the compact spare tire. (→P. 477)
■When using the compact spare tire
As the compact spare tire is not equipped wi th a tire pressure warning valve and trans-
mitter, low inflation pressure of the spare tire will not be indicated by the tire pressure
warning system. Also, if you replace the compact spare tire after the tire pressure warn-
ing light comes on, the light remains on.
■When the compact spare tire is equipped
The vehicle may become lower when driving with the compact spare tire compared to
when driving with standard tires.
■If you have a flat rear tire on a road covered with snow or ice
Install the compact spare tire on one of the front wheels of the vehicle. Perform the fol-
lowing steps and fit tire chains to the rear tires:
Replace a front tire with the compact spare tire.
Replace the flat rear tire with the tire removed from the front of the vehicle.
Fit tire chains to the rear tires.
4
5
1
2
3
WARNING
■When using the compact spare tire
●Remember that the compact spare tire provid ed is specifically designed for use with
your vehicle. Do not use your comp act spare tire on another vehicle.
●Do not use more than one compact spare tire simultaneously.
●Replace the compact spare tire with a standard tire as soon as possible.
●Avoid sudden acceleration, abrupt steering, sudden braking and shifting operations
that cause sudden engine braking.

532Alphabetical index
GS450h_OM_OM30G62U_(U)
Eco drive mode ..................................... 258
EDR (Event data recorder) ...................10
Electric motor (traction motor) ......... 66
Electric Power Steering (EPS) ....... 269Function ..................................................269
Warning light ...................................... 405
Warning message .............................. 410
Electronic key ........................................... 118 Battery-saving function .....................137
If the electronic key does not operate properly.............................454
Replacing the battery ...................... 382
Emergency, in case of If a warning buzzer sounds.......... 404
If a warning light turns on.............. 404
If a warning message is displayed ......................................... 410
If the 12-volt battery is discharged .........................................457
If the electronic key does not operate properly ........454
If the hybrid system will not start....................................... 450
If the parking brake cannot be released ........................452
If you have a flat tire ........................... 441
If you think something is wrong.............................................. 403
If your vehicle becomes stuck .... 466
If your vehicle has to be stopped in an emergency .............................397
If your vehicle needs to be towed ...................................... 398
If your vehicle overheats ................. 461 Emergency flashers ............................ 396
Energy monitor ........................................ 110
Engine
Accessory mode ................................ 183
Compartment ..................................... 353
Engine switch ........................................182
Hood..........................................................351
How to start the hy brid system ....182
Identification number......................... 471
Ignition switch (power switch) ..................................182
Overheating...........................................461
Power switch .........................................182
Engine compartment cover............. 354
Engine coolant ...................................... 358 Capacity................................................. 475
Checking ...............................................358
Preparing and checking before winter .................................... 276
Engine coolant temperature gauge ........................................................ 88
Engine oil ................................................. 355 Capacity................................................. 473
Checking ...............................................355
Oil level warning message .............410
Oil pressure warning message.............................410
Preparing and checking before winter .................................... 276
Engine oil maintenance data ............344
E