GS - 2nd Gen (1998-2005) Discussion about the second generation GS300, GS400 and GS430 (1998 - 2005)

O2 Sensors question?

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Old 09-01-11, 03:46 AM
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milellie11
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Originally Posted by DMPesso
And you listed the same part number twice
"I bought both Denso 234-4623 and 234-4623. Got 234-4623 replaced and that did the trick.
I would buy both to save some hassle. If you don't need 234-4630, you can always return it back to amazon."

can you clear that up for me so I know which one to order and replace first. Thanks
Sorry,meant 234-4623 and 234-4630. I replaced 234-4623. Its after the catalytic converter.that code you got can mean three things:1.bad cat 2.exhaust leak 3.bad 02 sensor. Before making the same expensive mistake like i did replacing the cats,do the sensor first.
Old 09-01-11, 03:58 AM
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milellie11
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Originally Posted by DMPesso
Milellie did you try changing your steering rack bushings. Im almost certain yours has play like mine does. I bet that would work, if not then its DEFINITELY the wider/bigger 17" wheels and low profile tires compared to the 16" 215/60s this car was originally equipped with. Let me guess you have the 17" lexus rims as well with the 235/45/17 tires? if its not the steering rack im GUARANTEEING its the rims and tires because ive experienced this with another car when I changed the rims, i went crazy thinking something was wrong changing everything for nothing meanwhile just putting the stock rims on the car fixed everything. Let me know im curious
yup,brand new rack bushings 6 months ago along with the other new suspension parts.You are spot on dude,i do have the factory chrome 17s on the car with michelin pilot sports a/s.they really make the car look sweet.But why would lexus put these on the car optional from factory if it makes the car ride like crap?
Old 09-01-11, 02:01 PM
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FERNDOGGS3
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i have a 2000 gs300 with 241,000 miles i just replaced my O2 bout six months a go, and bout a month a go got the same code on my cat bank one. I got a quot for mine and since i live in Cali the cat that i need (california emissions) i got a price of 500 just for Cat 1. any one Know where to get a better deal in Cali?

The good thing is i got my car with 103k and have not had to replace anything till now 3 yr later.
Old 09-01-11, 03:15 PM
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Originally Posted by FERNDOGGS3
i have a 2000 gs300 with 241,000 miles i just replaced my O2 bout six months a go, and bout a month a go got the same code on my cat bank one. I got a quot for mine and since i live in Cali the cat that i need (california emissions) i got a price of 500 just for Cat 1. any one Know where to get a better deal in Cali?

The good thing is i got my car with 103k and have not had to replace anything till now 3 yr later.
Where you california are you?
Old 09-01-11, 03:26 PM
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DMPesso
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did you try changing the other o2 sensor in that same bank? or did you only change one? maybe thats the issue and not the cat

Originally Posted by FERNDOGGS3
i have a 2000 gs300 with 241,000 miles i just replaced my O2 bout six months a go, and bout a month a go got the same code on my cat bank one. I got a quot for mine and since i live in Cali the cat that i need (california emissions) i got a price of 500 just for Cat 1. any one Know where to get a better deal in Cali?

The good thing is i got my car with 103k and have not had to replace anything till now 3 yr later.
Old 09-01-11, 03:27 PM
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Im in Merced CA
Old 09-01-11, 03:28 PM
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DMPesso
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wow and I was just about the replace the rack bushings because they do have some play. Did it help at all? is it worth it? because its like $200 in labor to replace all 3 right?

Originally Posted by milellie11
yup,brand new rack bushings 6 months ago along with the other new suspension parts.
Old 09-01-11, 03:29 PM
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FERNDOGGS3
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No i have't i have only replaced the O2 on bank 2
Old 09-01-11, 03:31 PM
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DMPesso
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I would say replace ALL the O2 sensors before throwing money on the cat. That what im deciding right now if I should replace one or all 4. What CEL code did yours throw?
Old 09-01-11, 03:34 PM
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DMPesso
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Is there more then 1 sensor on each bank? im not sure how many there are
Old 09-01-11, 03:35 PM
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Originally Posted by DMPesso
I would say replace ALL the O2 sensors before throwing money on the cat. That what im deciding right now if I should replace one or all 4. What CEL code did yours throw?

Don' know its in the shop right now for some noise that its making (I posted a thread on it) it bealy came on yesterday he checked the code he didn't tell me the code he just told me it was my cat 1
Old 09-01-11, 03:37 PM
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Originally Posted by DMPesso
Is there more then 1 sensor on each bank? im not sure how many there are
Yea their is 3 or four i think
Old 09-01-11, 03:54 PM
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Millellie, try swappiing out with someone who has 16s i can GUARANTEE it will drive like a better car because I just sold my 99 with 16s and I can tell the difference especially out here in NY with these ****ed up roads.
Old 09-01-11, 03:55 PM
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Originally Posted by FERNDOGGS3
Don' know its in the shop right now for some noise that its making (I posted a thread on it) it bealy came on yesterday he checked the code he didn't tell me the code he just told me it was my cat 1
If the cat is rattling, its possible the material inside is broken. Looks like u are gonna need a new cat. Just make sure it had an executive order number that matches with the application
Old 09-01-11, 03:59 PM
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Here are some executive order number that pertains to your application, 2000 GS300.

1. D-562-44
2. D-562-54

They are universal fit. Manufacturer are from Airtek and Valina. They are CA certified legal aftermarket cats. Good luck


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