Codes#0430 "catalyst Efficiency below threshold (bank 2)"
Thread Starter
Driver School Candidate
Joined: Aug 2011
Posts: 11
Likes: 1
From: ny
Codes#0430 "catalyst Efficiency below threshold (bank 2)"
Hi. I have an ls430 2004 model. Recently check engine light went on and had my auto-shop check it out. He said that this code is showing up.
P0430 "catalyst Efficiency below threshold (bank 2)"
Auto shop says its just the driver side Catalytic Converter.
I had replace the converters at 183,000 miles 16 to 18 months ago at the dealer and now i have 238,000 miles on my car. My dealer said only one year warranty on the converters. So, that warranty is over.
Now, the car is running good but i can't pass inspection because I am due for it soon.
As i was reading the forum, i am not sure what to replace. The "oxygen sensor" or the "converter". Is it possible that just the "oxygen sensor" might not be working properly. Its not showing up in emission hook-up scope that the auto-shop is using. I have never replaced the "oxygen sensors" unless the dealer did it when they replaced the converters at 183,000 miles. If someone had similar problem let me know how to deal with it. Thx.
P0430 "catalyst Efficiency below threshold (bank 2)"
Auto shop says its just the driver side Catalytic Converter.
I had replace the converters at 183,000 miles 16 to 18 months ago at the dealer and now i have 238,000 miles on my car. My dealer said only one year warranty on the converters. So, that warranty is over.
Now, the car is running good but i can't pass inspection because I am due for it soon.
As i was reading the forum, i am not sure what to replace. The "oxygen sensor" or the "converter". Is it possible that just the "oxygen sensor" might not be working properly. Its not showing up in emission hook-up scope that the auto-shop is using. I have never replaced the "oxygen sensors" unless the dealer did it when they replaced the converters at 183,000 miles. If someone had similar problem let me know how to deal with it. Thx.
Lead Lap
Joined: Mar 2009
Posts: 665
Likes: 2
From: Md
I would go back to the dealer where you had the work done at first since u spent money with them, they may give a discount if complain to the right people . I thought bank 1 was driver side and bank 2 passenger.
Rookie
Joined: Feb 2010
Posts: 60
Likes: 0
From: IL
Problem is likely a leak in the exhaust pipe after the secondary O2 sensor underneath the SST heat shields. I just went through this saga myself. Fix was a simple weld job to seal the leaks.
http://us.lexusownersclub.com/forums...howtopic=70886
http://us.lexusownersclub.com/forums...howtopic=70886
From the pic below, it's on the passenger side. Recheck if any O2 sensors being change as real high milages. Please go with OEM whether cat or O2 as aftermarket can go out anytime and don't last very long.
Last edited by votru; Nov 26, 2011 at 10:12 PM. Reason: Error
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3rd Gear
Joined: Oct 2022
Posts: 3
Likes: 0
From: Abu Dhabi
Problem is likely a leak in the exhaust pipe after the secondary O2 sensor underneath the SST heat shields. I just went through this saga myself. Fix was a simple weld job to seal the leaks.
http://us.lexusownersclub.com/forums...howtopic=70886
http://us.lexusownersclub.com/forums...howtopic=70886
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Driver
Joined: Nov 2021
Posts: 65
Likes: 27
From: FL
With car off. Blow a shop vac or leaf blower up the tail pipe. Spray bottle with soapy water, squirt all around the catalytic converters and all pipe joints etc. unless will appear wherever your leak is. May need to have it welded up or replaced. I fixed my p0420 with $5 of high temp muffler cement, as it was a tiny leak.
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