engine code p0420 and p0430 - Nissan Titan Forum
Titan Engine, Transmission & Drivetrain Technical discussion about the engine, transmission, and drivetrain.

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#1 (permalink) Old 08-21-2010, 08:53 AM
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engine code p0420 and p0430

i failed my emissions inspection today due to OBD diagnostic codes. The trouble codes are p0420 and p0430 that is catalyst system below threshold bank 1 and 2. Not really sure what i should do replace the cat's or use a 02 simulator. I have a 07 with 238,000 mile on the tuck, the shop that did the emission said it would cost $5,000.00 to fix. I've known i had this problems for months and been drive the truck with engine light on, still runs great. I think i can fix this myself and save money. From what i understand you can only buy it from the dealer, it is sold as one header and cat.
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#2 (permalink) Old 08-21-2010, 10:07 AM
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Re: engine code p0420 and p0430

thats not a code for your cats its the code for both o2 sensors at the cats, the top two.
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#3 (permalink) Old 08-21-2010, 10:19 AM
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Re: engine code p0420 and p0430

so that should be a easy fix, so just replace the 02 sensors?
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#4 (permalink) Old 08-21-2010, 05:07 PM
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Re: engine code p0420 and p0430

Ah those codes are not good, it's not just the 02 sensors.

A few folks who got that codes end up having to replace the whole engine
when their cats broke apart and got sucked back into the engine.

Now if you were running aftermarket headers than the sensors could be a culprit.

Its official P0420
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#5 (permalink) Old 08-21-2010, 05:51 PM
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Re: engine code p0420 and p0430

Probably just bad cats man. If your truck is still running (holy crap look at those miles on an 07! You drive to China and back everyday??), then just 1: replace the cats on the manifold and b-pipes with some magnaflows of the same size. 2: Get LT headers and have some magnaflow cats welded ino the same spot as the cats in the b-pipes. Basically, you have a set of cats on the manifold and a set in the b-pipes. You do not need all 4 cats to pass emissions. (04-06 2wd's came with only 2 cats and was emissions safe). It would actually be cheaper for you to just get Longtube headers and use them to replace the OEM manifold/cat combo, then cut out the OEM cats in the b-pipes and weld in some Magnaflow cats. You can def get it done fore less then a grand

2008 LRG8 GT: Kooks LTs/mids, Rotofab, Crawford tune, 18" Nurburgring, paddle shift, FE3/Eibach.....12.73 at 109.25

Sold2005 6.0 GTO.
Bolt-on's, FAST 102 I/M, suspension, D.S., weight reduction...12.500 at 112
http://www.titantalk.com/forums/off-...-gto-mods.html

Sold2005 Crew Cab...13.735 at 99.15 NA and 13.338 at 103 100 shot
http://www.titantalk.com/forums/off-...ml#post2563888
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#6 (permalink) Old 08-21-2010, 05:53 PM
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Re: engine code p0420 and p0430

If you only have cats in the b-pipes like I was suggesting, you would have to move the rear O2 sensors behind the cats. Or you could buy Uprev and have them "delete" your cat codes, although I don't recommend that

2008 LRG8 GT: Kooks LTs/mids, Rotofab, Crawford tune, 18" Nurburgring, paddle shift, FE3/Eibach.....12.73 at 109.25

Sold2005 6.0 GTO.
Bolt-on's, FAST 102 I/M, suspension, D.S., weight reduction...12.500 at 112
http://www.titantalk.com/forums/off-...-gto-mods.html

Sold2005 Crew Cab...13.735 at 99.15 NA and 13.338 at 103 100 shot
http://www.titantalk.com/forums/off-...ml#post2563888
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#7 (permalink) Old 08-22-2010, 07:09 PM
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Re: engine code p0420 and p0430

Thanks for the help! I put a lot of miles on my trucks for work – I just love this truck. $1,000.00 dollar repair sounds a lot better, especially with a proformance gain and when I need another set of tires this month. Been searching the forum to get a grocery list together, but couple questions.
1.going to get – Doug Thorley header
2.Magniflow High flow cats (2) - 94035 (one o2 port) or 94165 (two o2 ports)
3.Looks like I have 4 sensors do I need all four

Mod I currently have: Level kit, Billy Boat exhaust, and Brute Force Intake
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#8 (permalink) Old 08-23-2010, 04:14 AM
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Re: engine code p0420 and p0430

You have 4 sensors, the front are AFR sensors that will screw into the new headers you get, the rear are the 02 sensors that you will need to place after those magnaflow cats. You can get the cats that have the 02 bung already welded into the rear of them or get a muffler shop to weld in the 02 bungs in the mid pipes after the cats

2008 LRG8 GT: Kooks LTs/mids, Rotofab, Crawford tune, 18" Nurburgring, paddle shift, FE3/Eibach.....12.73 at 109.25

Sold2005 6.0 GTO.
Bolt-on's, FAST 102 I/M, suspension, D.S., weight reduction...12.500 at 112
http://www.titantalk.com/forums/off-...-gto-mods.html

Sold2005 Crew Cab...13.735 at 99.15 NA and 13.338 at 103 100 shot
http://www.titantalk.com/forums/off-...ml#post2563888
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#9 (permalink) Old 01-26-2012, 02:46 PM
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Re: engine code p0420 and p0430

Quote:
Originally Posted by O-FiveCC View Post
Probably just bad cats man. If your truck is still running (holy crap look at those miles on an 07! You drive to China and back everyday??), then just 1: replace the cats on the manifold and b-pipes with some magnaflows of the same size. 2: Get LT headers and have some magnaflow cats welded ino the same spot as the cats in the b-pipes. Basically, you have a set of cats on the manifold and a set in the b-pipes. You do not need all 4 cats to pass emissions. (04-06 2wd's came with only 2 cats and was emissions safe). It would actually be cheaper for you to just get Longtube headers and use them to replace the OEM manifold/cat combo, then cut out the OEM cats in the b-pipes and weld in some Magnaflow cats. You can def get it done fore less then a grand
My brother has a 2004 Titan with 132K miles and is seeing these two codes. Knowing nothing about his truck, can you further explain the above please.

What a b-pipes? LT headers? Aftermarket?

Thanks,
John
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#10 (permalink) Old 01-26-2012, 06:01 PM
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Re: engine code p0420 and p0430

LT's are longtube headers. If you look at the factory exhaust manifold, it has a cat welded to it. Right after the cat, it is flanged to a short section of pipe. That short section of pipe is the b-pipe. The reason to go Long tube headers (if you don't have to go through emission's), is because it eliminates the primary cat (while giving you some extra HP too). The primary cats are prone to failing. If he has a 4x4, then he has a second set of cats in the b-pipes. If that's the case, then after doing headers, install the factory set of sensor's (sensors in the bpipes) behind that second set of cats. Or, buy 2 magnaflow high flow cats, and install in place of the OEM second set of cats. Then still move those sensors behind the magnaflows. All this talk of sensors and second set of cats, is all relative to if you install longtube headers. You can also install some JBA shorty headers, and have cats welded to them and installed in place of the OEM exhaust manifolds/cats. This will require some fab work and welding though. LT's just bolt right in. I know it seems confusing, don't hesitate to ask if you have any more questions.

2008 LRG8 GT: Kooks LTs/mids, Rotofab, Crawford tune, 18" Nurburgring, paddle shift, FE3/Eibach.....12.73 at 109.25

Sold2005 6.0 GTO.
Bolt-on's, FAST 102 I/M, suspension, D.S., weight reduction...12.500 at 112
http://www.titantalk.com/forums/off-...-gto-mods.html

Sold2005 Crew Cab...13.735 at 99.15 NA and 13.338 at 103 100 shot
http://www.titantalk.com/forums/off-...ml#post2563888
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#11 (permalink) Old 01-26-2012, 08:39 PM
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Re: engine code p0420 and p0430

Thanks for the explanation. He does have a 4x4 model. NYS does have emissions, but as long as the check engine light is off it passes (there is NO sniffer test).

Fewer cats the better if possible... so, would LT headers and 2 magnaflow high flow cats with factory sensors behind those cats satisfy the onboard computer to keep the CEL light off?

The original poster mentioned 4 sensors, do two go before the cats?

Thanks,
John
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#12 (permalink) Old 01-27-2012, 01:57 AM
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Re: engine code p0420 and p0430

Yes, you have 2 sensor's the plug directly into your headers. Those will not need to be moved. The second set of sensor's reads the exhaust air after the primary cat, so when you remove the primary cat, you need to put it behind another cat. He could go catless and have get Uprev tuning, and have them remove those codes from the system as well. And yes, the set-up you mentioned would work.

2008 LRG8 GT: Kooks LTs/mids, Rotofab, Crawford tune, 18" Nurburgring, paddle shift, FE3/Eibach.....12.73 at 109.25

Sold2005 6.0 GTO.
Bolt-on's, FAST 102 I/M, suspension, D.S., weight reduction...12.500 at 112
http://www.titantalk.com/forums/off-...-gto-mods.html

Sold2005 Crew Cab...13.735 at 99.15 NA and 13.338 at 103 100 shot
http://www.titantalk.com/forums/off-...ml#post2563888
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#13 (permalink) Old 01-27-2012, 06:14 AM
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Re: engine code p0420 and p0430

Thanks,
two cats sounds like a good way to go, as long as they remove enough emissions for that second set of sensors.

If there is one sensor in each exhaust manifold, would that move to a port (if equipped) in the new LT header, or in the [before cat] hole in a 94165 cat?

I see quite a few header sets for this truck, what set do you suggest (best fit, nice quality)? Also, are there any other flanges, etc off the top of your head I would need?

Welding is not a problem, I have used universal exhaust parts in many applications, but have yet to see the underside of his truck which is 2 hours away from me.

(BTW, Nissan said $2,500 to replace "main" cats)

-John

Last edited by Hubjeep; 01-27-2012 at 06:17 AM.
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#14 (permalink) Old 01-27-2012, 07:41 PM
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Re: engine code p0420 and p0430

Well, 2x4 model's of that year have 2 cats, so you will be fine. The headers will have a bung for the primary (AFR) sensor's.. I suggest either the Stillen or Doug Thorely's...And out of those two I lean to the Doug Thorely's.

2008 LRG8 GT: Kooks LTs/mids, Rotofab, Crawford tune, 18" Nurburgring, paddle shift, FE3/Eibach.....12.73 at 109.25

Sold2005 6.0 GTO.
Bolt-on's, FAST 102 I/M, suspension, D.S., weight reduction...12.500 at 112
http://www.titantalk.com/forums/off-...-gto-mods.html

Sold2005 Crew Cab...13.735 at 99.15 NA and 13.338 at 103 100 shot
http://www.titantalk.com/forums/off-...ml#post2563888
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#15 (permalink) Old 01-28-2012, 08:54 AM
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Re: engine code p0420 and p0430

Quote:
Originally Posted by O-FiveCC View Post
Well, 2x4 model's of that year have 2 cats, so you will be fine. The headers will have a bung for the primary (AFR) sensor's.. I suggest either the Stillen or Doug Thorely's...And out of those two I lean to the Doug Thorely's.
Thanks. Will I need any additional pipes, flanges, etc besides the cats and headers?

So if the headers have the primary sensor holes should I get cats with only one hole [94035 Magnaflow] (I assume the single hole cat has the hole on the outlet side of the cat)?

BTW, are there any writeups about this maybe with pics?
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