Doggone O2 Sensors/Cats!!! PO 440 , 441 & 446 (might NOT be sensors) - ClubLexus - Lexus Forum Discussion


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Doggone O2 Sensors/Cats!!! PO 440 , 441 & 446 (might NOT be sensors)

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Old 12-17-08, 12:51 AM   #2
skperformance
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How do all your 02 sensors and cats go at once?
I was able to get original spec universal denso's for about $20+ for my LS .
Cats are hard to kill , something must be running real bad to do that much damage.
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Old 12-17-08, 08:25 AM   #3
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Quote:
Originally Posted by 1SICKLEX View Post
I'm just venting .....seems they went....so now I have to buy some. Merry Christmas to Mike
Mike,

First a couple of questions for you then some FYI's...

- How do you know that your cats are bad?
- Are you getting a rotten egg smell?
- What code(s) are you getting? PO430?

I was getting a PO171 (engine bank 1 too lean) and am now getting a PO430 (catalyst inefficiency condition) on top of that. Hoping that it isn't my cat because there is no smell coming from the exhaust I bought all 4 brand new OEM Denso O2 sensors. I paid around $290.00 at sparkplugs.com for all four O2 sensors shipped to my door!!! I am getting these sensors installed in a week or so. Perhaps you too want to go this route first before looking into a new cat...I heard it's a lot of $$$. GL!
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Old 12-17-08, 10:53 PM   #5
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Come on , more details , what is it doing . You know we all know more than any lexus technician !

LOL

Seriously , all 6 parts cannot fail at once unless the car is on fire or the exhaust bolts are broken causing it not to ground and read the senors right.
If you can get a laser temp reader and aim it at each cat , it will give you an idea if it is working or not as the temp of the metal before and after the actual cat will be much cooler after driving the car for at least 20 minutes.
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Old 12-30-08, 12:16 AM   #15
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i have the same issue with the 446 code..new OEM cap and still lit up..no gas smell or anything..would that mean check valve? is that cheap? easy to DIY? i aint tryna get a new canister..i heard those thangz are expensive!!
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2001 , 2002 , 440 , 441 , 446 , camry , cats , code , codes , damnit , fault , flow , is300 , lexus , o2 sensor , po441 , purge , toyota , toyoto

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