ClubLexus - Lexus Forum Discussion - GS - 2nd Gen (1998-2005)

GS - 2nd Gen (1998-2005) Exterior & Interior Options from Mod in Japan

ModInJapan — Tue, 26 May 2026 21:28:09 GMT

Hey everyone, Mod in Japan carries exterior and interior upgrade options for the GS -
2nd Gen (1998-2005). This guide covers aero parts, body styling, exterior accessories,
and interior add-ons where available.

Quick GS - 2nd Gen Exterior & Interior Buying Guide

Front Lips / Front Spoilers: Best first exterior upgrade for a more aggressive front-
end without replacing the full bumper.

Side Skirts / Side Splitters: Best paired with a front lip to make the side profile look
lower and more complete.

Rear Diffusers / Rear Lips: Best upgrade for cleaning up the rear bumper area,
especially when paired with an exhaust setup.

Spoilers / Wings: Best for adding a sportier rear profile. Trunk spoilers are usually
cleaner, while wings are more aggressive.

Carbon Fiber Accessories: Best for premium exterior detail pieces like mirror caps,
fender trim, rear garnishes, and spoilers.

Interior Accessories: Best for improving the parts you touch and see every day,
including steering wheels, trim, mats, pedals, and cabin accessories.

Quick Recommendations

Best first exterior upgrade: Front lip, window visors, or subtle spoiler
Best full aero setup: Front lip + side skirts + rear diffuser
Best rear styling upgrade: Rear diffuser or trunk spoiler
Best spoiler option: Trunk spoiler or roof spoiler
Best interior upgrade: SuperPro 1998 Lexus GS300 Base Steering Rack and Pinion
Mount Bushing Kit - SPF4087K

Aerodynamics & Body Styling

DFC 06-13 Lexus GS430 Rear-R Premium Caliper - Silver Zinc Coated - 331-75624
Type: Exterior / interior accessory
Best For: Exterior styling upgrade
SKU: dfc331-75624
Price: 88.26 USD
Product URL:
https://www.modinjapan.com/catalog/p...iew/id/379945/

DFC 98-10 Lexus GS400 Front-L Premium Caliper - Silver Zinc Coated - 331-75015
Type: Exterior / interior accessory
Best For: Exterior styling upgrade
SKU: dfc331-75015
Price: 130.25 USD
Product URL:
https://www.modinjapan.com/catalog/p...iew/id/379924/

DFC 98-10 Lexus GS400 Front-R Premium Caliper - Silver Zinc Coated - 331-75014
Type: Exterior / interior accessory
Best For: Exterior styling upgrade
SKU: dfc331-75014
Price: 130.25 USD
Product URL:
https://www.modinjapan.com/catalog/p...iew/id/379923/

Power Stop 2006 Lexus GS300 Front Autospecialty Brake Kit w/Calipers -
KCOE5272
Type: Exterior / interior accessory
Best For: Exterior styling upgrade
SKU: psbKCOE5272
Price: 335.66 USD
Product URL:
https://www.modinjapan.com/catalog/p...iew/id/414656/

Power Stop 2006 Lexus GS300 Front Left Autospecialty Caliper w/Bracket - L6041
Type: Exterior / interior accessory
Best For: Exterior styling upgrade
SKU: psbL6041
Price: 90.58 USD
Product URL:
https://www.modinjapan.com/catalog/p...iew/id/417622/

Power Stop 2006 Lexus GS300 Front Red Calipers w/Brackets - Pair - S6040
Type: Exterior / interior accessory
Best For: Exterior styling upgrade
SKU: psbS6040
Price: 235.48 USD
Product URL:
https://www.modinjapan.com/catalog/p...iew/id/418158/

Power Stop 2006 Lexus GS300 Front Right Autospecialty Caliper w/Bracket -
L6040
Type: Exterior / interior accessory
Best For: Exterior styling upgrade
SKU: psbL6040
Price: 90.58 USD
Product URL:
https://www.modinjapan.com/catalog/p...iew/id/417621/

Power Stop 98-05 Lexus GS300 Front Left Autospecialty Caliper w/Bracket -
L2775
Type: Exterior / interior accessory
Best For: Exterior styling upgrade
SKU: psbL2775
Price: 117.20 USD
Product URL:
https://www.modinjapan.com/catalog/p...iew/id/416766/

Power Stop 98-05 Lexus GS300 Front Red Calipers w/Brackets - Pair - S2774
Type: Exterior / interior accessory
Best For: Exterior styling upgrade
SKU: psbS2774
Price: 313.59 USD
Product URL:
https://www.modinjapan.com/catalog/p...iew/id/417915/

Power Stop 98-05 Lexus GS300 Front Right Autospecialty Caliper w/Bracket -
L2774
Type: Exterior / interior accessory
Best For: Exterior styling upgrade
SKU: psbL2774
Price: 117.20 USD
Product URL:
https://www.modinjapan.com/catalog/p...iew/id/416765/

Power Stop 98-05 Lexus GS300 Rear Red Calipers w/o Brackets - Pair - S2840
Type: Exterior / interior accessory
Best For: Exterior styling upgrade
SKU: psbS2840
Price: 285.49 USD
Product URL:
https://www.modinjapan.com/catalog/p...iew/id/417926/

R1 06-15 Lexus GS300 Right Front Drilled & Slotted Geo-Carbon Rotor - 830-
75013D
Type: Exterior / interior accessory
Best For: Premium carbon fiber styling
SKU: rnc830-75013D
Price: 149.70 USD
Product URL:
https://www.modinjapan.com/catalog/p...iew/id/400941/

Exterior Accessories & Trim

Power Intake Panel Filter - Lexus 00-05 IS300 / 98-05 GS300 - 503-T107
Type: Mirror caps / exterior trim
Best For: Exterior styling upgrade
SKU: APEX-503-T107
Price: 55.46 USD
Product URL:
https://www.modinjapan.com/power-int...0-98-05-gs300-
503-t107-apex-503-t107.html

Interior Accessories

SuperPro 1998 Lexus GS300 Base Steering Rack and Pinion Mount Bushing Kit -
SPF4087K
Type: Interior accessory
Best For: Interior feel and driver touch point upgrade
SKU: sprSPF4087K
Price: 61.52 USD
Product URL:
https://www.modinjapan.com/superpro-...on-mount-bush-
kit-front-lexus-gs-2000-2005-sc-2001-2010-s.html

For setup recommendations, availability, or formal quotes, email
sales@modinjapan.com.

03 gs430 starter replacement now throwing a P0021 code

DaTsHuF — Mon, 25 May 2026 22:32:55 GMT

Hey yall looking for some help with this one, starter bearings broke replaced starter, intake gaskets, valve cover gaskets, spark plugs, and misc connectors and hoses that broke. Vehicle starts up and runs, idle is high tested all vacuum hoses with carb clean, and now vehicle is throwing a P0021 code. Wondering if anyone else has had or heard of this issue? Wondering if when the starter failed if it jumped a tooth, or should I just test the VVT solenoid and cam sensor?
Any feedback is much appreciated.

Car Overheated after hose replacement car no longer will start cranks but no start

leocervantes — Mon, 25 May 2026 09:09:35 GMT

Car over heated while driving home after bad installation of a hoses on radiator swap car turned on day of issue starting car sat for 1 month now it just cranks no start swapped oil but still nothing not sure issue at dead end and plan on just parting out car

Attached Files

IMG_0167.mov (13.31 MB)

1998 gs400 knocking noise from cam gear area

GSTOR00 — Sun, 24 May 2026 01:55:09 GMT

So I installed this bee r rev limiter and was messing with the launch control setting and after that, I got codes for vvti solenoids and cam position sensor. originally I thought it was rod knock but I can hear the noise through the intake manifold, aswell as the front timing cover/valve cover it�s to high up to be rod knock then I thought it was a bent valve but the car idles and runs fine just has that weird noise. So I took the valve cover off and checked the shim spec and all of them are in spec so I doubt there is a valve that�s bent or stuck open. So I�ve ruled out: rod knock, and bent valves so should I pull the timing over and check on my tensioners aswell as guides and belts and inspect my vvti gears? And advise or tips would be appreciated I�m going to look into it today more. Here is a video of the sound I�ve been hearing I�ve ran it for like 2 hours and the noise doesn�t get any louder or worse it just stays the same. Normally I�m good at diagnosing knocking noises if this sort but the 1uz is new to me and not a lot of info for the 1uz is widely shared or I experience issues that I�ve never heard people experience aswell

Attached Files

IMG_1222.mov (11.64 MB)

2001 lexus gs300 all door lock actuator

fahhad20 — Sat, 23 May 2026 23:41:16 GMT

recently i got this 2001 gs300, only driver door actuator work, passenger side and both rear wont lock unlock,
i was wondering any one just chage the tiny motor inside ? any diy advice? i know you can buy actuator assembly, hard to find ,
i woudl like to fix the original one ,
thank you

2001 gs300 tire size,

fahhad20 — Fri, 22 May 2026 06:27:20 GMT

just got 2001 gs300, im looking for new tire, it came with 17' wheel with 225/45/17, and this tire look smaller compare to vehicle,

can i fit 225-50-17" ?? any one have experience with this size,

also how is 235-45-17 would look ?
thanks

'99 GS400 - Limp mode

Fms01 — Tue, 19 May 2026 22:18:35 GMT

So I was reconnecting my battery after installing a new alternator and accidently created a short across the terminals (big spark!). Now the car is in limp mode and showing error codes P1125 Throttle control motor circuit, P1349 VVT System malfunction (bank 1), P1656 OCV circuit (bank 1).
I checked all the fuses and relays in the engine bay and kick panel, everything appears to be ok.
I "think" I need to replace the ECU but wanted to check with the smart people here first incase there were other ideas on what to check.
If I do change the ecu with another of the same part number, will I need to go to Lexus to have it or the key coded?

Thanks in advance,
Julian in KCMO

heater malfunction diagnosis

pathtwo — Mon, 18 May 2026 18:56:56 GMT

i have a 1998 gs400. heater function seems weak. AC good, defrost good, blower function solid. what should i consider? thanks.

Immobilizer issue please help before i sell car.

saiphak — Sun, 17 May 2026 00:32:56 GMT

i have a 99 gs300. so my issues started with an intermittent security flashing light no start. it got worse, PRNDL lights went out on dash, on my hvac unit it showed � �-� for the outside temp, and it lost obd2 comm. i have good constant 12v , ecu grounds, and ign power i have confirmed all at the pins on the ecu. i have a used ecu from a 2000 gs and i plugged in and still have no comm from obd2 port and all problems i stated persists. please help 😭. transponder key amplifier had some corrosion on the board so i cleaned it with 91% isopropyl alcohol and still no luck. im confused and at a dead end. any help will be greatly appreciated as i am close to parting out the car or selling it.

P0121 code

3uzchiv — Fri, 15 May 2026 04:50:59 GMT

I am getting a p0121 on my 02 gs300 and I am wondering what I could do to fix that ? Any tips on what I should check or look for?

GS400 Timing/ General questions

offwhitelexus — Fri, 15 May 2026 03:34:57 GMT

Hey!
I'm thinking about doing the timing belt, water pump, and pretty much anything else preventative on my 98 GS400 while I have it apart. Does anyone have any advice for a 1UZ VVTI timing job?

I watched a few YouTube videos and have a general understanding, but I'm also going to find a service manual to follow the process.

On a separate note ive been hearing a bit of noise under acceleration that sounds like a lifter tick. Are the valve shims easy to adjust? The car has 78k miles and a great service history.

Ive done a bit of work to it so far, mainly lowering springs, a strut brace, a full suspension refresh, and a cat-back exhaust, so I'm pretty comfortable with tools, but not with engine work.

Thanks for any advice!

Is it possible to switch from a nakamichi to a pioneer unit?

Lexkey — Wed, 13 May 2026 21:42:11 GMT

I have a 1999 GS300 with nakamichi head unit. The front right speaker goes in and out, the tape deck stopped working. And to add insult to injury, the radio isn't working either. I was thinking about replacing it with an aftermarket system.

That would require doing more than i really want. I found a head unit, and the amp behind the glove box in the salvage yard, they are holding it for me until tomorrow. I was hoping to it would be feasible.
The pioneer unit is from a 2002. Any help would be appreciated.

NEED HELP 2000 GS300 2JZ-GE: Problems after replaced timing belt

plasui — Wed, 13 May 2026 03:45:54 GMT

Hi everyone. Before we start, this is the link for picture of timing and video while the car was running https://www.facebook.com/share/p/17iLFZp2Kb/
I need help diagnosing my 2000 Lexus GS300 (2JZ-GE VVT-i). I�ve been fighting this issue for over a month after doing a timing belt job.

What I replaced:

Timing belt
VVTi Cam Gear
Water pump
Spark plugs
Ignition coils
Coil connectors
OCV (Oil Control Valve)
Crankshaft position sensor

Current symptoms:

P0300, P0301, P0306
Belt tensioner shaking
Heavy shaking/misfire at idle
RPM drops
Ticking noise on startup
Car eventually stopped starting

I rechecked timing multiple times and the marks look almost perfect. Maybe off by 1-2 mm at most, if crank is at TDC.

Compression test results:

Cylinder 1 = 0 compression
Haven�t done a leak-down test yet

Important details:

Problem started AFTER timing belt job
Hydraulic tensioner mounting was giving me issues before
Had some cracked vacuum/breather hoses
No major knocking noise, only ticking

At this point I�m trying to figure out:

Could this still somehow be a VVT-i/timing issue?
Could valves be stuck open?
Or is a bent valve the most likely cause?

I�m honestly exhausted and just looking for experienced advice before deciding whether to pull the head, swap engines, or sell the car.

Any help is appreciated.

Picked up 98 GS400 how to switch out stock navigation with CarPlay.

Yancy6624 — Sun, 10 May 2026 22:00:00 GMT

Hey guys I�m picking up a clean 98 GS400 this weekend. I�ve done the research but can�t find much, I understand that I need to pickup a non-nav ac unit from same generation that will be plug and play. I need the metra dash kit. I�ve seen that I�ll need to bypass the amp at the passenger kick board. What are the next steps. Appreciate all the help, wish someone would do a video on this. I do have a local shop near me that I can use I�m just trying to have the steps in case the shop automatically says it can�t be done.

thanks again! I�ve installed a CarPlay into my 06� V8 4x4 4Runner but Crutchfield did the wiring harness so pretty simple.

Excited about this

new platform!

Wiring diagram?

jyyzzo — Sun, 10 May 2026 13:03:28 GMT

Does anybody have wiring diagram for this, and the lexus navigation computer thing.
Screen works and radio plays, but A/C and the map does not work.
(not my picture)