2006 Lexus GS430 check engine light

GAUGES, METERS AND SERVICE REMINDER INDICATORS
80Although it is no problem to continue driving, have your
vehicle
checked by your Lexus dealer as soon as possible.
(m) Electric Power Steering System Warning
Light
The light comes on when the engine switch is selected in
“IG−ON” mode. If the electric power steering system works
properly, the light turns off after a few seconds. If the system
has malfunctions, the light comes on again.
If the following conditions occur, this indicates a
malfunction somewhere in the components monitored by
the warning light system. Contact your Lexus dealer as
soon as possible to service the vehicle.
 The light does not come on when the engine switch is
selected in “IG −ON” mode or remains on.
 The light stays on while you are driving.
The warning light turning on while racing the engine for a long
time may not indicate malfunction. To turn off the light, restart
the engine and start driving.
CAUTION
If the electric power steering system warning light
comes on, take your vehicle to your Lexus dealer as
soon as possible. In this case, more effort is required
for the steering wheel to turn than usual. Drive your
vehicle while firmly gripping the steering wheel.
(n) PreCollision System Warning Light
The light warns that there is a problem somewhere in the
pre−collision system.
The light comes on when the engine switch is selected in
“IG−ON” mode. If the system works properly, the light goes off
after a few seconds.
If the light does not come on when the engine switch is selected
in “IG−ON” mode, have your vehicle checked by your Lexus
dealer.
(o) Low Fuel Level Warning Light
This light comes on when the fuel level in the tank becomes
very low. Fill the tank as soon as possible.
On inclines or curves, due to the movement of fuel in the tank,
the low fuel level warning light may come on earlier than usual.
(p) Key Reminder Buzzer
This buzzer acts as a reminder to turn off the engine when you
bring out the electronic key from the vehicle with the engine
switch in “IG−ON” or “ACC” mode.

GAUGES, METERS AND SERVICE REMINDER INDICATORS
81
How to check all the service reminder
indicators
(except the low fuel level warning light):
1. Apply the parking brake.
2. Open the door.
The following service reminder indicator should come on. It
goes off when you close the door completely.
3. Select the engine switch in “IG−ON” mode.
The following service reminder indicators should come on.

or
(red)
or
or

(yellow)
WG10
WG6 WG7 WG8
The following service reminder indicators go off after a few
seconds.
WG6
WG8 WG10
GS300 only—The above and following service reminder
indicators go off after a few seconds.
(yellow)

or
The following service reminder indicator goes off after about 6
seconds.
The lights other than the slip indicator light may stay on for
about 60 seconds after the engine is started. It is normal if they
go out after a while.
If any service reminder indicator or warning buzzer does not
function as described above, have it checked by your Lexus
dealer as soon as possible.

GAUGES, METERS AND SERVICE REMINDER INDICATORS
85
Trunk Open Warning
G13007
When any door, hood or trunk is open with the engine
switch in “IGON” mode, a message appears to let you
know which door, the hood or trunk is open. If you
continue driving in this condition, the master warning
light flashes and a warning tone sounds when the vehicle
speed exceeds 5 km/h (3 mph).
If any of the above warning messages appears, stop your
vehicle and close the door, hood or trunk securely.
 Moon Roof Warning
G13013
If the driver’s door is opened with the engine switch
turned off and the moon roof opened, the master warning
light flashes, a warning tone sounds and the above
message appears.
When you leave your vehicle, be sure to close the moon roof.
Parking Brake Release Warning
G13009
If you start driving with the parking brake applied, the
master warning light flashes, a warning tone sounds and
the above message appears when the vehicle speed
exceeds 5 km/h (3 mph).
If the above warning message appears, stop your vehicle and
release the parking brake.
 Headlight Leveling System Failure Warning
G13010
If there is a problem in the automatic headlight leveling
system, the master warning light comes on, a warning
tone sounds and the above message appears.
If the above warning message appears, have your vehicle
checked by your Lexus dealer as soon as possible.

GAUGES, METERS AND SERVICE REMINDER INDICATORS
86
Rear Lights System Failure Warning
G13011
If there is a problem in the rear lights system (tail lights,
license plate light, stop lights, rear side marker light, high
mounted stoplight), the master warning light comes on, a
warning tone sounds and the above message appears.
If the above warning message appears, have your vehicle
checked by your Lexus dealer as soon as possible.
 Low Washer Fluid Warning
G13020
When the fluid level in the tank becomes very low, the
master warning light flashes, a warning tone sounds and
the above message appears.
Fill the tank as soon as possible.
 Low Engine Oil Pressure Warning
G13012
When the engine oil pressure becomes too low, the
master warning light flashes, a warning tone sounds and
the above message appears.
If this message appears while you are driving, pull off the road
to a safe place and stop the engine immediately. Call a Lexus
dealer or qualified repair shop for assistance.
The message may appear when the oil level is extremely low.
It is not designed to indicate low oil level, and the oil level must
be checked using the oil level dipstick.
NOTICE
Do not drive the vehicle while this warning message is
displayed even for one block. It may ruin the engine.

GAUGES, METERS AND SERVICE REMINDER INDICATORS
87
Low Engine Oil Level Warning
G13022
When the engine oil level is too low, the master warning
light comes on, a warning tone sounds, and the above
message appears.
Add oil as soon as possible. (For instructions, see “Checking
the engine oil level” on page 522.)
While driving on steep inclines or rough roads which causes
the vehicle to substantially sway or on curves, this message
may appear due to the movement of engine oil in the engine.
In normal conditions, due to engine oil consumption, this
message may a ppear earlier than the specified service interval
of the scheduled maintenance. This is because the engine oil
is consumed to the low level within the scheduled maintenance
interval and does not indicate a problem. (For detailed
information, see “Facts about engine oil consumption” on page
520.)
NOTICE
Continued engine operation with low engine oil will
damage the engine.
 Engine Oil Maintenance Reset Warning (U.S.A.
only)
G13033
This message indicates that the engine oil maintenance
data has been reset. After replacing the engine oil, be sure
to reset the maintenance data.
To reset the data, perform the following operations:
1. Push the “ODO TRIP” switch in the switch box to
change the display to blank.
2. Turn the engine switch off.
3. Turn the engine switch on with the trip meter “RESET”
switch held down.
4. Keep pushing the “RESET” switch for longer than 7
seconds after the engine switch is turned on.
After the above operation, the master warning light comes
on, a warning tone sounds and the above message
appears to inform you that the engine oil maintenance
data has been reset.

GAUGES, METERS AND SERVICE REMINDER INDICATORS
88
Engine Oil Replacement Reminder (U.S.A. only)
G13035
If the driving range exceeds 4,500 miles after the engine
oil maintenance data is reset, the master warning light
comes on, a warning tone sounds and the above message
appears for about 15 seconds when you select the engine
switch in “IGON” mode.
This message indicates that the engine oil should be replaced
soon. If the message appears, it is recommended to inspect
the engine oil with the engine switch off. For details about
inspection, see “Checking the engine oil level” on page 522.
If the engine oil level is low, engine oil should be replaced.
Have it replaced at your Lexus dealer.
After the engine oil replacement, reset the engine oil
maintenance data and make sure the “OIL MAINT RESET”
appears on the display.
NOTICE
The warning message on the display is based on the
driving range after the engine oil maintenance data
reset. This is not based on the monitoring of dirty
condition of the engine oil.
 Engine Oil Replacement Warning (U.S.A. only)
G13034
If the driving range exceeds 5,000 miles after the engine
oil maintenance data is reset, the master warning light
comes on, a warning tone sounds and the above message
appears.
This message indicates that the engine oil should be replaced
as soon as possible. If the message appears, it is
recommended to inspect the engine oil with the ignition off. For
details about inspection, see “Checking the engine oil level” on
page 522.
If the engine oil level is low, engine oil should be replaced.
Have it replaced at your Lexus dealer.
After the engine oil replacement, reset the engine oil
maintenance data and make sure the “OIL MAINT RESET”
appears on the display.
NOTICE
The warning message on the display is based on the
driving range after the engine oil maintenance data
reset. This is not based on the monitoring of dirty
condition of the engine oil.

GAUGES, METERS AND SERVICE REMINDER INDICATORS
90
Tire Pressure Warning
G13025
When the low tire inflation pressure is detected while
driving, the low tire pressure warning light and master
warning light come on, and the above message appears.
If the above message appears, adjust the tire inflation pressure
to the specified level as soon as possible. Push the tire
pressure warning system reset switch for a few seconds and
make sure the warning message goes off. If the message still
remains on, have your vehicle checked by your Lexus dealer
as soon as possible.
G13024
This message indicates the tire pressure warning system is
initialized. After replacing the tires or wheels, adjust all 4 tires
to specified tire inflation pressure and initialize the tire pressure
warning system. To initialize the system, start the engine and
push the tire pressure warning system reset switch for longer
than 3 seconds with the vehicle stopped. The above message
appears.
G13026
If there is a problem electrically in the tire pressure
warning system, the low tire pressure warning light and
master warning light blink and the above message
appears.
Although it is no problem to continue driving with the above
message on the display, have your vehicle checked by your
Lexus dealer as soon as possible.

GAUGES, METERS AND SERVICE REMINDER INDICATORS
92
G13017
If the steering lock is malfunctioning, the master warning
light comes on, the engine switch indicator light blinks
amber and the above message appears.
The engine will not start in this case. Contact your Lexus
dealer as soon as possible.
G13018
If the steering lock is not unlocked due to the load applied
to the steering wheel when pushing the engine switch, the
master warning light comes on, the engine switch
indicator light blinks green and the above message
appears.
The engine will not start in this case. To start the engine, push
the engine switch again while turning the steering wheel in
either direction.
Lexus Park Assist System Warning
G13077
If icicles, snowflakes or mud gets on the ultrasonic
sensors of the Lexus park assist system when the system
is on, the above message appears and the vehicle symbol
and indicator bars continue flashing until the suspected
sensor is cleaned.
Remove the foreign matter or deice the sensor, the system
returns to normal.
G13076
If the ultrasonic sensor of the Lexus park assist system is
malfunctioning or a sensor cable is broken when the
system is on, the malfunctioning sensor flashes, 2 beeps
sound 5 times and the above message appears.
The flashing sensor is disabled, but other sensors work
properly. Have your vehicle checked by your Lexus dealer as
soon as possible.