So after I do plugs then I will consider a bad MAF. I think I remember hearing it is bad to attempt to clean them on a 5.5 gen??? Estimated cost of a new MAF?
And the light comes and goes with no trend as to why/what/when/how.

 

I'd repalce the MAF before the plugs. Easier, though not cheaper. And that code is rarely the cause of bad plugs.

Also, whenever the light goes on, get it read, then refer to the FSM for a description.

New MAF = ~ 90-100$. Install time, ~ 2-4 minutes.
New Plugs = ~ 40 - 55$. Install time, ~ 60-120 mintues.

 

LMAO.....yea i see ya point

 

unfortunately a catback exhaust wont make the p0430 go away


but yet again, according to the FSM, an exhaust leak could be a "POTENTIAL" problem also

i know for my 2001 the p0430 is the front precat...the one right in front of the radiator...i was thinking about just replacing it with one from Eastern Catalytic from autopartswarehouse.com...simply because an OEM precat would cost upward of 500 bucks, AND TO TOP IT OFF...i dont want to go headers

i want a cattman ypipe and a cattman catback....

 

I have a P0420 which is for bank1. Took it to Nissan to get it checked out and they blamed on my aftermarket y-pipe because it has no pre-cats. I highly doubt it would be the pre-cats since I've had it for about a year now. I know that there's a possibility that exhaust leak can trigger such code. My question now is... the flex section of my y-pipe is scratched up kinda bad and would a leak from there trigger the CEL?

 

Well plugs need changed regardless so that's gonna happen.
I did have it read yesterday immediately after the code appeared and got the P0430 Catalyst -- --- (Bank 2).
1. If it is from the cat being blocked up or bad then a cat-back would help??
2. But the pre-cat that was mentioned (I assume its right after the exhuast manifold)... can that just be eliminated w/o much trouble; trouble meaning more random and vague codes??
3. About cleaning the MAF on the 3.5L...do or don't do???

 

Why would a catback do anything? A catback is only from the cat back, so nothing is being altered from the cat on. A catback bolts onto the cat flange, and only modifies post cat, not pre cat. The cat in which a catback refers to the main cat, the which is the last in a series of cats.

You can punch them out or get headers. But, IMO, that is masking the problem. Might as well toss a piece of black tape on the SES light.


I clean mine all the time, so that is up to you, but again, cleaning is a form of masking if the problem persists even after cleaning. Clean it and see.

 

Well I was thinkin it was the main cat that would be blocked up.
So it's the pre-cat that comes off the exhaust manifold? Can't you just eliminate it with a pipe in place of the pre-cat rather than hollowing it out?

 

Even if it was, a catback wont do squat, since it modifies only AFTER the main cat.

Aside from that, there are no post or in (main) cat O2 sensors on the 02+, they are all pre main cat, so even if the main cat shat itself, no on would ever know.

You haven't looked under there have you?

If you're going to go that far, might as well get headers.

It's far more complex than just adding a pipe. There's a catalyst, and the obvious cast iron manifolds.

 

You're right I haven't looked under there regarding the exhaust b/c I've had no serious intentions of doing anything up that far on the exhaust.
And thanks for clearing up the O2 sensor cat locations. I also thought a new cat came with the cat-back systems.. but it looks like it just comes with resonator, mid-pipe, and muffler tail section.

Sorry for my lack of knowledge/research on that subject.

 

I have the same problem!! First was pulling the P0420, changed the front 02 now I'm getting the code of P0430. Im thinking about getting a Y-Pipe from Warpspeed today and sticking that on the car. Been doing some reading but not enuff....will a y-pipe do away with Catties or 02 or either??


http://forums.maxima.org/5th-generat...aler-ship.html

 

well what year car do you have?

a Y PIPE eliminates "ONE PRECAT" and that is the one in the middle, or the rear precat....the front precat which is the one causing the p0430......the only thing that will replace the front precat is another front precat, OR HEADERS

not many manufactur After Market precats for our cars, and an OEM one IS NOT WORTH THE CASH unless you get it for a steal...OEM's from what ive researched range from 500-900 bucks.

 

Cats die because of a lean condition, so that would point to MAF most commonly. Getting headers or replacing pre-cats, etc, IMO, is just a band aid for the real problem.

 

Newbie here, but my understanding was that code P0430 was usually preceded by another one that would point to the most likely cause of this reading. Such as my case; I got code P1320 Ignition, and code P0430. I was told that the latter could be a result of the former. Please correct me if I'm wrong

 

Correct, ignition coils can also hurt cats since, if they are not working properly, the will let unburned fuel enter the exhaust stream and eventually **** of the O2 sensor related to P0420.

 

Thank you. I'm goint to attempt to find the defective(s) coil(s) using a testing method described by a fellow member in another thread, and replace only those for the time being. Eventually I'll replace all of them just like I would do if I was replacing a defective strut.

 

I was in the same situation. I got the updates installed in the ECU all seems well.

 

I got my ECM reset by Autozone last week after getting codes P1320 and P0430. My engine was running rough while SES, TCS OFF and SLIP lights were on. Those lights came back on soon afterwards and today I got the engine scanned again. It showed the same P1320 code but this time along with P0302 (cylinder 2 misfire). I purchased the coil from them, installed right there and my car is back running smooth and powerful. I'm keeping my fingers crossed hoping there will be no more issues any time soon.

 

I highly doubt they reset your ECU for you. Chances are they just cleared your codes.

 

I guess you're right, sorry, that's what I meant to say. Does "reset" means something else?

 

They 'flash' the ECU, which is either updating the software/firmware, adding new software in, or something of the sort.

I'm not 100% on that process, but I can guarantee that Autozone would not be doing it, for free at that.

Typically, only dealers have the tool to update or reset the ECU software, mainly because it's quite a few thousand dollars for the tool.

 

Guys, I have the same P0430 a day after I replaced the O2 sensor. I had the P0138 and P0139, which pointed to Rear O2 sensor. I replaced it, had Autozone clear the codes and a day later P0430 shows up. Took to Nissan asking for an update. They said update is only for P0420. In my case, 430 is bad catalyst, they looked at it and saw that it was broken. Does that sound honest of them? Why wasn't it showing P0430 before, along with O2 sensor codes?

Thank you

 

yea i have a 03 maxima with 133k and i have that code P0430 its the precat the one in the front i lifted up the car thinking it was a rattling nosie coming from inside of the bottom of the engine when i hit the gas or start the car but its the front cat i hit it with my hand and hered like mad little rocks inside of a can so im figuring that my problem i was told to just go get a whole new muffle system from front to back and that will solve my problem and clear my code and the cheapest way to go . what can u guys tell me about that. any suggestions

 

your precat is broken. your most cost effective solution is to purchase an eastern catalytic pre-cat and put it on yourself. if you cant do it yourself, it's still cheaper to buy the eastern cat and have a local mechanic put it on for you than it is to replace your entire exhaust system. click the link below to see what you need.

http://www.autopartswarehouse.com/de...EAST40476.html

 

ok i think im gonna do that cuz to get a whole new exhaust is like 300 or something like that with universal cats that they put on . i mean i have 133k and my exhaust might need a change soon it looks very old and rusty down there i mean it can also have a leak somewere . another question sorry if its dum but my car vibrates at a stop mostly at the steering wheel can this be because of my bad exhaust or broking precat and i also feel my cars performance very low compared to other maxima i cleaned my maf and car is up to date with everything eles just this problem with exhaust and precat .

 

Interesting, good to know other companies make our precats. Here I was thinking an OEM replacement precat for $400 was my only option.

 

My car is throwing me some codes like p1564 a/t speed control device.
Po442 evaparation small leak. Can somebody plzz tell me what can I do or what things can I do about this.

 

i have the same issue ! was this ever resolved ? i need to find a cat bank 2 i am 90% sure that's the issue just hoping for a little reassurance and possibly a after market parts tip off because i don't feel like paying the dealer sh!tloads for it there are aftermarket brands such as walker and Bosal ! are these any good ?

 

I purchased an Eastern aftermarket pre-cat. Perfect fitment and code went right away. Total damage in parts was about $180.

 

cool thanks ... how long have you had it in now and how many miles on it ... do u do mostly highway driving or ?

 

about 3 years, probably in the area of 40k miles, mixed driving.

 

great news I'm probably going to order one from rock-auto ... but I'm going to check to see if there's a leak or anything 1st !

 

Had same code but in my case it would appear and maybe after 100 miles go away by itself, be gone for another 500 miles and then comeback ect.

Got the eastern cat, no problems ever since.