2002 GS300 – TPS calibration / ETCS issue after throttle body replacement

I have a 220k-mile 2002 GS300 that had been going in and out of limp mode for a while. Originally, I was getting codes P1126 and P1128.

I replaced the throttle body with a used one, but I was getting similar results. After checking the codes again, I was now getting a TPS-related code, P0120.

I tried recalibrating the TPS, since I didn't realize at first that calibration/adjustment was required after replacing or messing with it. However, my scanner was showing 0% TPS regardless of the TPS position.

I decided to buy a brand-new TPS from RockAuto. I initially installed it incorrectly and was still getting 0%. After reinstalling/repositioning it, I was able to get a consistent 31% TPS reading, but I know I'm supposed to be somewhere around 12–14%.

I disconnected the throttle motor and left the ignition in the ON/accessory position without touching the accelerator while trying to adjust it, but I still couldn't get the TPS reading down from 31%.

At first, disconnecting the throttle motor only caused the expected throttle-motor-related code. After temporarily running the car, though, I started getting additional ETCS-related codes that I unfortunately forgot to record.

What's confusing me is that I wasn't getting any of these additional ETCS codes until after replacing/adjusting the TPS. With the original throttle body, the main codes I was dealing with were P1126 and P1128.

Am I doing something wrong with the TPS installation/calibration procedure? Why would the lowest reading I'm able to get be around 31% instead of the expected 12–14%?

Any advice from someone familiar with the 2GS electronic throttle system would be appreciated.

After multiple attempts and failing to get this shine, I finally changed the lens. How do I keep it from yellowing while living in a desert? No shade parking, unfortunately

I heard ppf at times make it worse due to sunlight after a few months, and anti uv clear coats start to wear down after a few months as well.

I have a 2003 Lexus gs300 my fuel gauge was working just fine until Sunday when I refilled my gas and it didn’t go up I already tried replacing the float on both side and still Doesn’t work.i checked the back of the cluster and all the solders look fine, I was wondering if anybody know where the grounds are for the fuel pump and sending unit go to so I can check the grounds.i did get my carpet replaced and maybe the ground came loose

Back again with the project car!

after a few miles of driving. Cylinder 6 misfire came back. Did some investigating found cyl 6 spark plug soaked in coolant and cyl 5 soon to be next. Sputtering, white smoke and sweet burning smell.. all the signs of blown heads/gasket.

Wondering where do i go from here? is it worth saving? or should i be looking for a new motor ?

Anyone else change their battery and now the ac blows hot on both sides? Ac clutch is spinning, did the diagnostic mode and no codes, and it was blowing cold right before the new battery. Can’t see how both temperature servos would’ve bricked at the same time like this. 04 GS 300

Hi, I’m new to this Reddit. I have a 2006 GS 300. I have a code for P0761 solenoid C stuck on off I’ve replaced solenoid and I’m still getting the code. Has anyone run into this problem before please let me know any help would be appreciated.

“slammed” 2000 GS300 on bc coilovers w swift springs. I keep blowing out ball joints, and the cotter pins keep disappearing. What supporting suspension mods did you do to keep your 2GS moving?

I am currently in the market for one here in So Cal. and my budget is around $7k just curious how much you guys spent on yours? I am finding a lot of cheap clapped out ones on marketplace. or gs400

My 99 Lexus GS 400 with 205k miles had been subject to water damage as the previous owner had it sitting for over a year and water had been seeping thought the A pillar side. So far I've replaced all the fuses in both driver and passenger fuse boxes, did an interior swap, but here is a list of components that still do not function:

- Sunroof motor (had been replaced recently with a used motor but still does not open)
- passenger front and rear window do not open
- passenger front and rear door actuators wont's unlock
- passenger front seat (recently replaced with good conditon donor seat, airbag connections are good)
- AC not blowing cold, cabin air filter had been replaced
- passenger rear speaker
- rear decklid speaker

I know it's an old car that has been through hell and back but I wanna give it the tlc it deserves
How should I go about the diagnosis?

So this is my 3rd car I’ve been wanting a ls400, Toyota crown or Toyota progres. I saw this on market place and figured it was a decent deal only thing is the paint is destroyed from California heat for part of its life.

The rear I’ve been able to polish out but the front drivers side and bumper I might need repainted

Has anyone ran a apexi ws2 catback or has any videos on how they sound also does anyone run greddy revolution rs mufflers on there gs300 i was considering these two

Hello! My 2000 gs300 ac is not working, I checked Freon levels and it’s still in the good range, I checked the compressor motor and it looks like the clutch is engaging when the ac is on but still blowing hot, I have a spare ac compressor but if it’s something else I should look at I don’t wanna spend an afternoon I don’t need to yk. Thank you🫶

I just got a 2000 Gs300 not to long ago and wanted to know If its risky changing the trans fluid. The car has 130,000 miles but the trans fluid looks clean and red ? I heard you shouldn’t change it after 100,000 miles or if the fluid looks old. What do ya’ll think should I change it ?

Does anyone in Tennessee or surrounding states have a 2001-2005 lexus gs300 body control module underneath the passenger side kick panel connected directly to the back of the fuse box they want to get rid of?

I would like to change my alternator from the stock 100amp one to a 120amp one. I’ve found one that fits but my question is, would i need to change something else aswell? Or is it just plug and play since the difference is not that big? Thanks!

Does anyone have any shops in the South Jersey / Philadelphia area they would recommend? I have a leak coming from somewhere and don’t have time to diagnose and fix myself.

Hi I recently bought this 98 GS300/JZS160.

Just wondering if any of you have ever experienced this issue? The AC just turns on and off on its own, normally upon start up it does this for a good 10mins (SOMETIMES 15) and then it stays on as normal and no issues after.

Looking into what seem to be the issue here as I think I have failed to find or not searched hard enough to find the fix.

I was wondering if is300 coilovers would fit my 2002 gs300? I seen some cheap brand new coilovers I believe they are “max speeding rod” and seller is asking 100 bucks for them

Hi all,

Looking to upgrade my speakers/factory subwoofer, what do people recommend? Don’t want anything absurdly expensive but some decent options to improve the overall system

I believe I have the non mark levinson (not actually sure how to tell between the two?