P0420 & P0430 Help!!!!!

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Sep 1, 2008 | 12:48 PM

LS1NUT26

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From: NW Indiana

P0420 & P0430 Help!!!!!

Well it started off being just P0141 (o2 sensor) and then before I could fix the O2 sensor, The codes P0420 and P0430 came up also. I replaced the O2 sensor and cleared all of the codes and a few key cycles later these two codes came right back.

The codes mean Catalyst System Low Efficiency Bank 1&2

What does it mean?
Will they go away by themself?
How can I keep them from coming up/ fix the Problem?

Thanks for all input.

Sep 1, 2008 | 12:52 PM

slow

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From: Orlando

P0420/P0430 are catalytic converter low efficiency codes.

Since you sig says "MAC ORY Pipe (catless)" I am assuming they are the cause of the issue.

Ryan

Sep 1, 2008 | 01:01 PM

LS1NUT26

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I never head these codes pop up until after I had the O2 sensor code.

the cats have been off for some time now.

Sep 1, 2008 | 01:43 PM

2001NBMZ28

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From: Jacksonville, FL

P0141 is the post-cat drivers side 02 heater circuit, which one did you replace? Are you running sims?

Sep 2, 2008 | 09:48 PM

LS1NUT26

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that is the same sensor that I replaced.
not running sims.
the codes 0420 & 0430 didnt come up the same time that the o2 sensor code.
it came a few weeks later.
now only getting these to codes.

Sep 3, 2008 | 07:33 AM

Gh0st

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You don't have cats, so why would you even have the codes enabled? Turn them off. It's pretty standard to turn them off when you have a high flow cat anyways.

Sep 3, 2008 | 08:17 AM

Engine_HP

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Quote:

Originally Posted by Gh0st

You don't have cats, so why would you even have the codes enabled? Turn them off. It's pretty standard to turn them off when you have a high flow cat anyways.

plus one......