Lexus GS 300 - Recent Questions, Troubleshooting & Support

I am guessing that you recently had a windshield replaced. If so they didn't seal it well and it leaks in there. You can go to a glass shop and have it re-sealed or you can buy sealer at most automotive stores and do it yourself.

The other option is that it is leaking in through the air intake between your hood and the windshield. That is the air intake for your heating and air conditioning. There are drains in the line that can get clogged up. If that is the case the best option is to take it to a repair shop.

1999 Lexus Gs... | Answered on Jan 08, 2019

1-5-3-6-2-4 is the correct firing order for the 3.0l 6-inline 2JZ.

1999 Lexus Gs... | Answered on Oct 22, 2018

trunk left hand side fuse #90 7.5

2006 Lexus Gs... | Answered on Sep 28, 2018

Your vehicle does not come equipped with an inertia fuel shut off switch. You will need to look elsewhere for this system failure. Possible causes could be: Anti theft (SRS) system, blow fuse, Relay, module, bad pump, wiring or connection or out of fuel. Please let me know if there is anything else I can help you with.

2001 Lexus Gs... | Answered on Sep 18, 2018

Something is being over looked. Diagnostics have to be performed to find out if this is related or a coincidence. I would first look, inspect and verify that the main accessory fuses are receiving 12 volts and are still properly grounded. What do you have for test equipment? Do you own a Power Probe, test light or multimeter? Please write back and let me know what tests you have run and what you have found so far. Most of these circuits are wired so they receive power when the key is in the ACC or RUN position and are activated from the Ground side.

2001 Lexus Gs... | Answered on Sep 18, 2018

I wanted to start a thread specifically about failures within the throttle body concerning the GS300 (1998 in my case)

My symptons were:
VSC, VSC OFF, and ENGINE Lights would come on, followed by my car going into Limp Mode, where only that last 25% (if that) of the throttle would respond (basically have to floor the pedal to even move at all).

During the mornings, or when the engine was COLD, the throttle operated normal...then once the car warmed up, usually at about 10 mins, the problem would happened intermitantly at first...1 or 2 days over the course of a week, then it became more consitent, until last week it became a daily problem.

The first part I tried was the Throttle Position sensor, which is on the front side of the throttle body, and the easiest thing to replace...this didnt help at all. $300 part from Lexus, $80 part from (exacly same part toyota OEM)

"Idle Valve Motor", which is the larger electrical object next to the TPS on my 98 GS300. Problem is solved.

The Codes I got were P1120 and P1121 - Accelerator Sensor problem. However it wasnt really the Accelerator Sensor, it was indeed to actual electrical Motor that controls the opening of the Butterfly valve inside the Throttle body.

I found the problem by good old trouble shooting, and using an ohm meter to see if the throttle electric motor was getting elev, I found that the elec motor just to the left of the TPS was basically freaking out and shutting down. The Accelerator Pedal Sensor is on the Back-side of the throttle body where the throttle cable connects to, and has a spring on it. It was fine.

GS300's are indeed "drive by wire" concerning the throttle...the cable triggers the Accel Pedal Sensor, which sends a signal to the ECU, the ECU then sends power to the Idel Valve Elec Motor (next to the TPS), which opens and closes the mechanical butterfly valve, then the TPS sensor detects how far the elec motor is actually opening the butterfly valve...its a closed-loop feed-back system, meaning any failure in any sensor will cause the entire systm to fail.

The throttle cable apparently is ONLY there to allow the fail-safe of having that last 10-25% throttle when the electronic system fails...there is a gearbox inside the throtle body which allows the tail end of the throttle to manually engage the butterfly valve...the rest of the time, the butterfly valve is 100% opened and closed via the idle control motor.

1998 Lexus Gs... | Answered on Mar 03, 2018

amigo revisa los terminales de los cables de bateria que tengan buen contacto, en segundo lugar revisa que el alternador envie el voltaje apropiado , avisame

1998 Lexus Gs... | Answered on Jan 23, 2018

fit a new battery and get a scanner tool to reset the ECM/immobilizer
mobile mechanics should have a scanner for the job

Lexus GS 300... | Answered on Nov 28, 2017

Check your oil. If it is milky/tannish, then all signs point to the possibility of a cracked engine block. I hope not. That would mean a new or rebuilt engine and probably a few thousand$$$. Hope it's something else, friend.

2006 Lexus Gs... | Answered on Nov 15, 2017

The purge valve is mounted in the engine compartment, probably on the firewall. It is held on by two bolts. It has an electrical connector and two vacuum hoses and looks like the pic below. . Release the connector and unscrew the two bolts. Move the vacuum lines from the old valve to the new one. Bolt the new valve down and connect the wiring harness.

download (10)-khhlhgabxhi45qdlqmlsiuhd-5-0.jpg

Lexus GS 300... | Answered on Oct 30, 2017

The new sensor has to be programmed. You probably need a scanner that can communicate with that system. Check for related trouble codes.

2006 Lexus Gs... | Answered on Oct 04, 2017

May need new actuator. Try a slight lubricant like wd40 if that does not work. Try working switch back and forth. They usually start having problems when they get this old. You can have it replaced, but toyota /lexus is notorious for labor intensive repairs with can be costly if you take it to a dealer or very time consuming if you replace the actuator yourself.

2003 Lexus Gs... | Answered on Oct 04, 2017

fault in drivers lock probably micro switch or solenoid get tested

2006 Lexus Gs... | Answered on Sep 29, 2017

Not finding what you are looking for?

-857 questions posted

Ask a Question

Usually answered in minutes!

Popular Products

Top Lexus Experts


Level 3 Expert

84027 Answers


Level 3 Expert

918 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22483 Answers

Are you a Lexus Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

View Most Popular

Lexus Cars & Trucks

  • Forum

View Most Popular

  • Lexus Cars & Trucks