code p0420 & p0430 - Nissan Xterra Forum
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#1 Old 06-11-2011, 06:59 AM
echo_nine
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code p0420 & p0430

Hey guys anyone have these come up at the same time. P0420 is bank sensor 1 malfunction and p0430 is bank sensor 2 malfunction. So somewhere from the headers to my rear o2 sensors something is bad on both sides. Could it be cracked manifolds letting in air and making the o2 sensors thinking there is something wrong? Could both cats be bad on both sides? Or could my rear o2 sensor be fouled up by running seafoam. Only reason that this could happen bc the codes got thrown a week after i did seafoam thru the evap line. Now remember for any of these scenarios its for both banks (sides in the exhaust passenger and driver) anyone experience this before or have any suggestions before i start throwing money at this? Thanks Matt

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#2 Old 06-11-2011, 09:21 AM
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I had this years ago when I first installed headers without the rear O2 sensor extensions. I can't see it being upstream as your headers replace the prone-to-cracking Gen1 exhaust manifolds. Can't see both cats taking a dump at the same time either. The rear sensors, if on extensions, are unlikely to factor and when I put my extenders on it fixed the code problem.

Seafoaming the evap line I'm drawing a blank on because I haven't even so much as looked at my evap line yet. I can't see Seafoam fouling an O2 sensor though, if anything it'll clear away any deposits.

Try flashing the ECU and seeing if the code comes back. Maybe cleaning the evap line changed some input that's making the ECU have a seizure. A flash gives you a new baseline.



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#3 Old 06-11-2011, 10:01 AM
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sorry for wording something wrong.. i still have the OEM exhaust manifolds (no headers) which i believe are cracked...

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#4 Old 06-11-2011, 12:55 PM
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Quote:
Originally Posted by echo_nine View Post
sorry for wording something wrong.. i still have the OEM exhaust manifolds (no headers) which i believe are cracked...
Bingo. Common Gen1 problem, start crawling around your engine and see if you can spot a crack on them. Replacing them with parts from a wrecker will be cheaper than getting headers if you want the cheap fix.



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#5 Old 06-11-2011, 01:08 PM
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ou think that the crack could be letting in air and throwing off the o2 sensors and making me throw a code? The reason I ask is bc i had a mustang (3.8) with cracked manifolds and it never threw a code...

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#6 Old 06-13-2011, 11:47 AM
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bump... been reading around looks like it could be because of an air intake leak? I have the body lift so that pulled the air intake assembly away from the motor so everything isn't as tight as I would like it to be... also read could be a bad MAF?

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#7 Old 07-14-2011, 12:35 PM
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I have a similar problem in that mine is throwing a code P0420. I'm not sure which side that is, but I can't imagine only one TWC going bad. When I did my seafoam, I noticed smoke coming out of the engine compartment as well. I have a 1.5 Gen with original headers so I'm wondering if it's an exhaust leak as well.
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#8 Old 07-14-2011, 06:29 PM
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I think those are cat efficency codes. according to the service manual I have its three way catalyst function for both codes. the code number denotes which bank. The cracked manifolds could be allowing air in and causing the upstream 02 sensor readings to be messed up and making the computer think the cat has failed. OR your cats are failed.
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#9 Old 07-14-2011, 09:06 PM
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Gen 1 cracked manifolds can make the codes go off. With all the shouding, they can be hard to see, but you usually can hear ticking when they are cracked.

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#10 Old 07-15-2011, 07:17 AM
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I'm gonna check this out tomorrow when I had planned to work on my truck. I think I remember hearing some ticking though. Does anyone know which code goes to which side?
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