almaxima

I HAVE A 2000 NISSAN MAXIMA WITH 59000 MILES AND IM GETTING A CODE P0420.fIRST TIME IT CAME UP IT RESET ITSELF CLEARED THE SERVICE ENGINE SOON LIGHT.CAME BACK ON I USED THE OBD2 DIGN. TOOL AND GOT CODE P0420 AND I RESET IT.THIRD TIME IT CAME BACK ON LATER ON AND THEN ONCE AGAIN COUPLE OF DAYS LATER IT RESET IT SELF AGAIN .SHOULD I JUST TAKE IT TO THE DEALER AND HAVE THEM UPGRADE OR FLASH MY ECM WHAT EVER ITS CALLED.AND IF THEY DO DO THAT IS THERE A CHARGE TO IT OR IS IT COVER UBDER WARRANTY,

PLEASE ANY RESPOND I WILL APPRECIATE IT THANK U

SEmy2K2go

iTrader: (10)

First, turn off your caps lock. Second, turn off your caps lock. But seriously, you need to find out what that code is for and being a 2000 with 59k miles, I'd say your factory warranty is long gone.

maximadave

iTrader: (10)

almaxima

thanks i guess, the code means bank 1 catalyst failure.i have seen people saying that you might need to upgrae your pcm or one or both mine oxygen sensors and also might be my catalyst?im just trying to find out were should i start cuss if i go to the dealer they will try to rip me off.Im thinking if i can just ask them to upgrade my pcm but then again i think they might try or force me too replace my oxygen sensors.

please reply with ideas or clues but not just to talk ish.

thanks

MAX_AE

I was in the same boat you're in about 3 months ago. Out of Warranty with the 420 code. Tell the dealer you know what the code is and the ECU needs reprogramming. They'll say, we'll have to get it on the computer anyway. Tell them you expect it to be fixed according to the emissions warranty. They'll say, "we'll check on that...". The dealer ended up not charging me for it, but I've heard many people on the forum say they did get charged. goodluck!

Lontar1

iTrader: (5)

That's normal on the 01 Se don't worry about it. mine has been on for more than 6 months but nothing bad had happened to the car. So either you pay $80 to flash the ECU.

almaxima

great thanks alot ill start from there and see what happens.

foodmanry

iTrader: (15)

Take it in to the dealer. There is a TSB for the problem. I think because it's emissions it falls under the 8/80 warranty (80,000 miles).

almaxima

i ask about it and they told me or he told me its a tsb not a recall for it. is there a difference only recalls are covered but not tsb?

Robr

Famous code 0420, I am one of the lucky owners of that F^&*&^* code.

Quick summary of what I've had done.
O2 sensor, only 1 by the radiator, light came back.
Main cat replaced, light came back. (Random Tech)
ECU re-programmed with the latest upgrades that are supposed to clear code, a week ago.
Also, had throttle body cleaned, and injectors by the dealer.

Code just came back on, again.

Dealer is persistant my main pre-cat by the radiator has to be the problem. They want $800.00

What to do?
I may just gamble and replace the other O2 sensor??

Anyone out there with a Nissan Technical degree???

Thanks

P.S.
The ecu reprogram will run you about 105.00 labor, but if you have under 70k miles it should be free. At least in CA, anyhow. Mine has 112K

almaxima

i guess i have to start by one and that will be the upgrade ecu by the way even though my car is salvage will the warranty of the 70k miles still count for me? if so im pretty sure they will try and b1tch about it and ill just do the same to them thanks for the input anyone else have any idea what rodr and i can do about this?

[maxi-overdose]

iTrader: (3)

if it does not affect performance and fuel economy, just leave it. mine turned on for 3 times already in these past three months. let it sit for 2 weeks, it turned off again.

maximum_rpm_nyc

P0420 Three Way Catalyst Bank 1.
P0430 Three Way Catalyst Bank 2.

Both have TSB (Bulletins) Not Campaign.(CA Spec Vehicles only.)
some required oxygen sensors replaced, some required front(B2) or rear(B1) catalysts replaced. Both result in ECM reflash, which takes 30 minutes.
Applies to 7/70 emissions warranty.
Nissan's systems will detect if a vehicle has a Salvage Title and print up as "Some warranties may not be applicable to vehicle."

Max_Vader_2K

so what about us with y-pipe are we screwd?

maximum_rpm_nyc

I swapped my Y pipe when I got the 420 code. so i am ok.

Max_Vader_2K

Did the light go out when you swaped back.

00MAXI

I did the $141 reflash and it worked. I never got a SES light again. Although sometimes I wish I had enough cash to get that BI rear 02 sensor replaced. The tech did show me a printout from the consult II saying that the reflash fixed the problem. I paid $141 bucks cuz when I walked in they charged me for a diagnostic fee on top of the reflash labor (even though I knew what the code was). I was at 95370 miles so the 8/80 thing didn't apply.

smoon629

iTrader: (1)

arite so, i just got an ses light and pulled a p0240 at autozone. i read a few threads and apparently, the problem is most likely my O2 sensor. However, can this also be that the ECU is screwy? should i first just got my ECU updated? Is this covered by warranty (i have a 2000)? How much is it to replaced the O2 sensor?

smoon629

iTrader: (1)

i meant the P0420, sorry.

smoon629

iTrader: (1)

bump...please help

almaxima

if my car is running fine and the code goes away by itself when i do the smog check will it pass? cuss thats my main concern.any input please help

Maxi113

iTrader: (3)

ahh i made this thread right around the same time, http://forums.maxima.org/showthread.php?t=319578 what should I do? :| I found the sensor, even a sensor simulator..Someone help! =)

almaxima

so if i got that code and it resets itself would it pass the smog test check?

Larrio

iTrader: (10)

god, its the blind leading the blind in here. its a thread of wrong information.

here you go
http://forums.maximaracing.org/viewtopic.php?t=96

btw, since its a ECU glitch it wouldn't affect smog check. However you can't pass smog with a check engine light on anyways

almaxima

yeah but u can pass it with the kight off but it will come back my point is the lights off i knoww if the light is on they wont pass it but i dont know if even with the light off it will indicating anything that will prevented from passing, but thanks u answered my question with it should not affect the smog check cuss when it comes back i can clear it off and it might come back like in one month.

Max_Vader_2K

Where is the TSB for this code.?

Larrio

iTrader: (10)

its off the www.nissanusa.com site