P0420 & P0430-need help
Thread Starter
Burning Brakes
Joined: Dec 2005
Posts: 831
Likes: 2
From: Silver Spring, MD
P0420 & P0430-need help
Hey guys,
I just started getting the "check engine" and scanned for codes and got the following. My search shows that this is related to the Catalytic converter or perhaps Oxygen sensors. I much rather embark on switching out the sensors ($$) vs. cat conv. Any one else experience this issue?
I just started getting the "check engine" and scanned for codes and got the following. My search shows that this is related to the Catalytic converter or perhaps Oxygen sensors. I much rather embark on switching out the sensors ($$) vs. cat conv. Any one else experience this issue?
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
Since you are running LG's, what is the rear oxygen sensor setup? Are you running sims? Best to tune them out as they eventually seem to throw this code. (I am guessing at your setup though, need more information).
Burning Brakes
Joined: Jan 2006
Posts: 1,170
Likes: 27
From: Magnolia Greens NC
It's those rear (bank 2) right & left 02 sensors...2 options: Tune them out with HP Tuners OR install 02 sims (simulators) in their place..."with the installation of long tube headers, the rear 02 sensors get such an increase in exhaust flow, they get different readings & you get P0420 & P0430 code warnings"....no harm, does not affect performence, but the DIC lights up!........
Thread Starter
Burning Brakes
Joined: Dec 2005
Posts: 831
Likes: 2
From: Silver Spring, MD
Thanks for the responses. No I do not have shims. I do need to update my profile:
LG long tube headers
Blackwing CAI
LS6 (just installed)
Prior to install, never had any problems but we checked everything over pretty good. It is running great or at least it seems to be. So it seems like I should by just bypass the sensors? How? Also, is there any point to getting a dynotune? Sorry for all the questions but I just want to get it right
LG long tube headers
Blackwing CAI
LS6 (just installed)
Prior to install, never had any problems but we checked everything over pretty good. It is running great or at least it seems to be. So it seems like I should by just bypass the sensors? How? Also, is there any point to getting a dynotune? Sorry for all the questions but I just want to get it right
Night Owl for life
Joined: Nov 2003
Posts: 24,725
Likes: 4,564
From: Bugs Bunny should'a made a left turn here
this is a very common and normal issue when you have LT headers and hiflo cats. the reason you had no problems before is that the stock cats get hotter because they are more restrictive.
the codes reflect the higher flow of the aftermarket cats. your best bet is to tune them out.
also, you NEED to get them tuned out if you are in an emmissions regulated county because if the code is present you will fail.
the codes reflect the higher flow of the aftermarket cats. your best bet is to tune them out.
also, you NEED to get them tuned out if you are in an emmissions regulated county because if the code is present you will fail.
Last edited by jdmvette; Oct 25, 2007 at 04:38 AM.
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Burning Brakes
Joined: Jan 2006
Posts: 1,170
Likes: 27
From: Magnolia Greens NC
"HP Tuners" has a program that can be used to tune them out (see my previous post)...go to a Tuner that has this program ...they will probably charge you $120 to $150, based on what the HP Tuners program cost them..
