2020 Lexus GS350 check engine

4857-2. Steps to take in an emergency
GS350_GS F_OM_OM30J07U_(U)
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When trouble arises
●Stop the vehicle in a safe pl ace on a hard, flat surface.
●Set the parking brake.
●Shift the shift lever to P.
●Stop the engine.
●Turn on the emergency flashers. ( P. 424)
●Check the degree of the tire damage.
A tire should only be repaired with
the emergency tire puncture repair
kit if the damage is caused by a nail
or screw passing through the tire
tread.
• Do not remove the nail or screw from the tire. Removing the
object may widen the opening
and disenable emergency repair
with the kit.
• To avoid sealant leakage, move the vehi cle until the area of the puncture, if
known, is positioned at the top of the tire.
■A flat tire that cannot be repaired with the emergenc y tire puncture repair kit
In the following cases, the tire cannot be repaired with the emergency tire puncture
repair kit. Contact your Lexus dealer.
●When the tire is damaged due to driving without sufficient air pressure
●When the tire lost air pressure due to a crack or damage in the tire sidewall
●When the tire is visibly separated from the wheel
●When the cut or damage to the tread is 0.16 in. (4 mm) long or more
●When the wheel is damaged
●When two or more tires have been punctured
●When there is more than one hole or cut in the damaged tire
●When the sealant has expired
Before repairing the vehicle

4927-2. Steps to take in an emergency
GS350_GS F_OM_OM30J07U_(U)
Check the specified tire inflation
pressure.
Tire inflation pressure is specified on the
label as shown. (P. 525)
Start the engine. ( P. 203)
To inject the sealant and inflate the
tire, turn the compressor switch on.
Inflate the tire until the recom-
mended pressure is reached. The sealant will be injected and
the pressure will spike to 44 psi
(300 kPa, 3.0 kgf/cm
2 or bar) or
58 psi (400 kPa, 4.0 kgf/cm2 or
bar), and then gradually
decrease.
The air pressure gauge will dis-
play the actual tire inflation pres-
sure about 1 minute (15 minutes at
low temperature) after the switch
is turned on.
Inject to recommended pressure.
• Turn the compressor switch off and then check the tire inflation
pressure. Being careful not to
over inflate, check and repeat the
inflation procedur e until the spec-
ified tire inflation pressure is
reached.
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4997-2. Steps to take in an emergency
GS350_GS F_OM_OM30J07U_(U)
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When trouble arises
When the engine does not start, the follo wing steps can be used as an interim
measure to start the engine if the engine switch is functioning normally.
Press the parking brake switch to check that the parking brake is set.
( P. 217)
Parking brake indicator will come on.
Shift the shift lever to P.
Turn the engine switch to ACCESSORY mode.
Press and hold the engine switch for about 15 seconds while depressing the
brake pedal firmly.
Even if the engine can be started using the above steps, the system may be mal-
functioning. Have the vehicle in spected by your Lexus dealer.
Emergency start function
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GS350_GS F_OM_OM30J07U_(U)7-2. Steps to take in an emergency
If the parking brake cannot be released
●Shift the shift lever to P.
●Turn the engine switch off.
●Check that the parking brake indicator is off.
●Chock the tires.
Take out the parking brake release
tool and the screwdriver from the
trunk. (
P. 474, 486)
Fit the parking brake release tool into
the screwdriver handle.
Vehicles with spare tire: Take out the spare tire. ( P. 477)
Vehicles without spare tire: Remo ve the center auxiliary box. (P. 488)
In the event that the battery is disc harged or switch operation does not
release the parking brake, the parking brake can be released manually using
the procedure below. This procedure should be performed only if necessary,
such as in an emergency.
If the switch cannot be operated even when the battery is normal, the parking
brake system may be malfunctioning. Have the vehicle inspected by your
Lexus dealer immediately.
Before releasing the parking brake manually
Releasing the parking brake manually
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5017-2. Steps to take in an emergency
GS350_GS F_OM_OM30J07U_(U)
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When trouble arises
Remove the plug.
Insert the tool and press it down
firmly while turning it counterclock-
wise until it stops.
■Manual operation of the parking brake
The parking brake cannot be set manually.
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WARNING
■When releasing the parking brake manually
●Shift the shift lever to P, turn the engine switch off and chock the tires. Failure to do so
may cause the vehicle to move , resulting in an accident.
●Turn the engine switch off and check that the parking brake indicato r is off. Failure to
do so may cause the system to operate and turn the inserted parking brake release
tool, resulting in an injury.

5037-2. Steps to take in an emergency
GS350_GS F_OM_OM30J07U_(U)
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When trouble arises
Ensure that the shift lever is in P and depress the brake pedal.
Touch the Lexus emblem side of the electronic key to the engine switch.
When the electronic key is detected, a buzze r sounds and the engine switch will turn
to IGNITION ON mode.
When the smart access system with push-button start is deactivated in customization
setting, the engine switch w ill turn to ACCESSORY mode.
Firmly depress the brake pedal and check that and a message (GS F
only) are shown on the multi-information display.
Press the engine switch.
In the event that the engine still cannot be started, contact your Lexus dealer.
Starting the engine
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5047-2. Steps to take in an emergency
GS350_GS F_OM_OM30J07U_(U)
■Stopping the engine
Shift the shift lever to P and press the engine switch as you normally do when stopping
the engine.
■Replacing the key battery
As the above procedure is a temporary measure, it is recommended that the electronic
key battery be replaced immediately when the battery is depleted. ( P. 411)
■Alarm
If the trunk is opened using the mechanical key when the alarm system is set, the alarm
may be triggered. ( P. 79)
■Changing engine switch modes
Release the brake pedal and press the engine switch in step above.
The engine does not start and modes will be changed each time the switch is
pressed.( P. 204)
■When the electronic key does not work properly
●Make sure that the smart access system wi th push-button start has not been deacti-
vated in the customization setting. If it is off, turn the function on.
(Customizable features:  P. 542)
●Check if battery-saving mode is set. If it is set, cancel the function. ( P. 157)
WARNING
■When using the mechanical key and operating the power windows or moon roof
Operate the power window or moon roof after checking to make sure that there is no
possibility of any passenger having any of their body parts caught in the window or
moon roof.
Also, do not allow children to operate the mechanical key. It is possible for children and
other passengers to get caught in the power window or moon roof.
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5107-2. Steps to take in an emergency
GS350_GS F_OM_OM30J07U_(U)
The coolant level is satisfactory if it is between the “FULL”/“F” and “LOW”/“L”
lines on the reservoir.
Engine coolant reservoir
“FULL”/“F”
“LOW”/“L”
Coolant inlet cap
Add coolant if necessary.
Water can be used in an emerge ncy if coolant is unavailable.
Start the engine and turn the air conditio ning system on to check that the radi-
ator cooling fans operate and to check for coolant leaks from the radiator or
hoses.
The fans operate when the air conditioning system is turned on immediately after a
cold start. Confirm that the fans are operating by checking the fan sound and air flow.
If it is difficult to check these, turn the air conditioning system on and off repeatedly.
(The fans may not operate in freezing temperatures.)
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