maxguy

I just replaced my O2 sensor for P0138. Does anyone know how long it takes for the ECU to realize that it has a new sensor and turn off the light? I'd turn it off by disconnecting the battery (I have a 2001), but I want to make sure the problem is really fixed. Thanks for any help.

IceY2K1

iTrader: (3)

It depends on the severity and could take awhile.

I'd unplug the battery overnight to force the ECU into relearn mode. If the problem is gone, it will stay off, if not, it will come back pretty quick typically.

doublea

iTrader: (7)

Hey Colonel, I didn't read the entire post but I though of confirming you that the 226A0-4L713 is the right O2 sensor for P0140. I replaced the same 2-3 weeks ago, I erased the P0140 and it never got back. I have a 2k1 Cali spec
maxima. That will take you like 20 minutes to replace it, the plastic ties are a biatch to remove cuz of limited space for your hand to reach some of the ties holder, I'm shure you know you need to jack the rear of the car to acces some of the plastic ties.

Good luck.

AA

doublea

iTrader: (7)

You need to erase the code with an ODBII consul, that's the way I erase cel once in a while. Resetting the ECU may do it this I really dont know. Autozone can erase the code, dont know how much they charge but some dealer charge like 90$ to erase codes I think that's ridiculous, you may want to try to unplug the battery for a couple of hour and see if it works, otherwise find a guy that has an ODBII consul and I'm shure he'll do it for free.

Good luck.

AA

IceY2K1

iTrader: (3)

doublea - Keep us posted if that CEL comes back.

I'm sure this is going to be a common occurance and with the dealer games, I'd rather know how long just changing the rear 02s lasts.

IceY2K1

iTrader: (3)

*bump*

Any word on the CEL coming back doublea?

Kevin

question about the ECM and what warranty , what is the 8yr /80k mile warranty?

my thought was that Emission warranty is 3yr/ 50k miles.

secondly, if the ECM upgrade is covered under warranty, can I just go in and have them upgrade the ECM for me? I can get the O2 sensor myself later and install it.

andy92801

hi I wanna know where can i find P0140 SENSOR 2 bank 1? I did went to dealer and they asking for $140 which is quite alot is there any other place or store where I can get cheaper than dealer price?

andy92801

I've just got replaced P0140 02 sensor a week ago cuz it was under no activity and SES light was on the mechanic replaced the sensor and the SES light goes off but after few days it went back on and I took car to autozone used thier diagnostic machine and it shows the same sensor gone bad again so what could be the reason should I keep replacing o2 sensor or do i have to also replace front o2 sensor at the same time i replace rear one?

andy92801

and after replacing the 02 sensors rear and front how can I make SES light disapear? cuz I might change o2 sensors by myself please tell me when and how will that SES light would disapear?

sloppymax

iTrader: (8)

if you replaced the correct o2 sensor and the light came back on then you need to have the ecu flash done. i am assuming you have a 2k/2k1 so all you need to do to reset the cel is unplug the negative battery cable from the terminal overnight. if the problem is truly still there, the ecu will just cycle the code right back out.

shurik

iTrader: (6)

My SES light lights on and goes off, it's P0138, is that normal for it to lit and to go off again???
Well and should I change it if it's important or just let it go????

bobby.cim

Hey Colonel, I know you said the car feels stronger/more responsive but what about your gas mileage? I have experienced pretty bad gas mileage.

How do I know whether I have a cali spec or fed spec?
When you ordered the sensors from DaveB did you have to splice them and hard was the installation "(any helpful how tos)?

Last question I swear, so only the reflash was covered under the TSB? I have 84K on my max will they cover that?

Sorry for all the questions, just really want to fix this problem!

Ephraim

iTrader: (15)

that is an answer to one of your questions

i was wondering though who has bought some OBDII software/tool kit and how has it worked. i have the pesky P0138 and P0139 code, so when i get a new 02 senser and put it on i will have to get the code cleared

sontakke

Since the car had minimum of 3yr/36K warranty and Colnol had only 34K miles on it when it started throwing codes, why did he end up paying for the repair? Nissan should have covered it in full.

- Vikas

MrPoisse

I have P0138 and P0139.
I happen to have a sitting MAF in my garage. Would it be a good idea to:
1- change my MAF
2- have my ECM reflashed to the lastest version

Do you think that the new version of the ECM program is less "restrictive" towards the O2 sensors, and that my SES codes will go away (if my O2 sensor is still alright)???

I am no longer under warranty, but with the TSB, its easy to ask the dealer "perform this reprogram please", pay for it and go away without paying a new O2 sensor.

I would like your comments on that.

BewstAdd1ct

if youre talking about labor time, replacing both rear o2 sensors pary 0.9hrs, thats a CP time, and thats NOT EACH. thats for both

per alldata

igzy

iTrader: (18)

You may find helpful:
http://forums.maxima.org/showthread.php?t=419384

6peed6

an autozone scan turned up P0140 & P0158...i want to replace these O2 sensors, but can't find a clear explanation of which of the s 4 sensors on the car these codes refer to...a diagram i got from a nissan parts guy uses different terminology...could someone tell me which sensors these codes refer to....since the sensors all have different colored wires and i know where the 4 of them are on the car, identifying the codes by wire color would be most helpful

MrPoisse

Ive got P0138 and P0139.

I changed my MAF recently, so I went to the dealer to ask for a ECU reflash (updated version for new MAF type), hoping it would resolve the O2 sensor issue at the same time.

The dealer refused to perform the reprogram on TSB NTB02-051a because the sensor (only 1, since I have a 2000 Fed specs) was not changed yet.
I firmly asked to perform the reprogram either way, and that I would change the sensor later, and he refused. It has to be done "by the book".

Damn it!
Im going to keep you informed on the issue once I change the sensor (bank1 sensor2) and have the reprogram done.

BTW, is there anything I should know before changing the O2sensor?
- do I have to disconnect the battery negative pole?
- do I have to have a special tool to unscrew th old one out?

any hint/suggestion would be very appreciated.

BewstAdd1ct

id use an o2 sensor socket, but you can use a 22mm wrench, but its more difficult and you can strip it if its in there real tight.

dont disconnect the battery while you do the repair so that way the code is still stored.

make sure you buy the 02 sensor from a nissan dealer (read: daveB, unless you have a local hookup) and keep the reciept...

igzy

iTrader: (18)

Could you help me guys, I had P0140 (fed/Canada spec), replaced the sensor, reset the ECM by disconnecting the battery for >24 hrs and the light came back on again for P0140 after 2 weeks. Do I need to reprogram the ECM, reset the codes with Consult? Could it be a faulty cat, MAF? Please help! This is driving me bananas...

thebear

I would call 1.800.nissan and talk nicely to the Customer Service people. I had a similar out of warranty o2 sensor replaced (the one closest to the firewall) and they refunded the entire cost after I sent them a copy of the dealer's repair invoice. It costs nothing to ask.

RR5

iTrader: (6)

I'm having the exact same problem. P0133 twice, reset at a local garage. Then P0138 which I reset with the code reader from Autozone. And now those codes do not come back??

The universal O2 sensor has 4 wires, you'll have to figure out which wire does what on your OE sensor and splice the appropriate wires into the universal one. My friend, who worked on cars for 20 years (Even with a high price diagnostic scanner) would not attempt that repair. Get the OE sensors from napa, they've even got ACCURATE images of the sensors, harness color and connector colors.

BewstAdd1ct

for some reason, most o2 sensor wires dont like solder.

MrPoisse

to keep you informed,
I had P0138, so I wanted to have my ECU reflashed (without changing the O2 sensor) to see if the new version of the ECU would be more tolerant to O2 sensor deviation, and clear the CEL on its own.
The tech at Nissan refused to reflash until I had my O2 sensor changed. So I changed it. At the same time, I changed my MAF (to updated version). I had the ECU reflashed to the MAF-updated version.

CEL for O2sensor is gone (DAH! I changed the O2 sensor!!!), and my MAF problems are gone (the motor was sometimes shutting off after hard acceleration).

unfortunately, I could not verify if my "old" o2sensor was still good...

OOmaxSE

iTrader: (19)

can't you just get an o2 simulator for the P0138,139,140 codes?

BewstAdd1ct

doesnt matter, the proper repair includes replacing the sensor...


though i suppose you could throw it back in and find out

BigFly_2K2SE

iTrader: (1)

Just to add some input to this thread, I was throwing a P0139 and P1147 for one of the O2 sensors a few weeks ago. I actually got the dealership to agree to do the TSB reprogram without replacing the O2 sensor, however, when I dropped the car off and they checked the ECM ID, they informed me I already had the most recent program???? I am not sure how exactly this could be unless when I took it in to have the timing advanced a few months ago they automatically put the most recent program in? In any case, assuming they were telling me the truth, my O2 sensor failed even with the program update.

MarineMax

I am having the same problems with p0139 and p1147. After reading over the service bulletin and talking with the stealer, have decided to replace the bank 1 rear sensor on my own. Anybody know where the cheapest place to buy oem o2's from? I am looking at buynissanparts.com but cant find them any cheaper than $101.

moriax

Ordered them from daveb yesterday 109 each. Throwing code P0139 on my 2k SE manual cali spec.Had maf replaced with updated version and new ecm reprogram then threw the P0139. I hope it goes away with the new O2s. New Ecm program was 12y069. Dealer will do another reprogram free if the new o2 still throws code. Got my fingers crossed. Ordered OEM because i didnt want to deal with splicing but will order simulators if the CAT is bad.

wope

iTrader: (1)

my 2k2 with 64k miles is throwing a P0138 code. it is no longer under warranty. it seems like i'll need 1-2 o2 sensors and an ecu reprogram.. how much $ am i looking at here at a nissan dealer?

thanks..

wope

iTrader: (1)

bump.......

igzy

iTrader: (18)

Quote I got for the same job at a local stealer was around $350 -> $260 for O2 replacement and additional $90 for reprogram...

VQ30GTR

Not necessarily. I have the same issue now. a po140, but I failed my emissions test. I had a warpspeed Y on it, failed 2X. I took the Y-pipe off, and put stocker w/cat back on. With reading my Auterra diag tool, the catalyst has to run its test, and takes at least a 1.5 tanks of gas to complete the cat test. when it does the test, I get the po140 again. I check the sensor with the auterra, and it does not respond after the cat test. Meaning if you drive or 43mph for 2 min, it should have a voltage of .56 +, mine only stays around .25v. Now before the cat test is complete, the sensor is reading fine, but that test goofs it up. I am wondering if it is my ecm now. I had a reprogram with the new 2k1MAF from dave b, and 17 degree advance.

I was looking to replace the sensor, but now am not sure if it is that or the cpu.

wope

iTrader: (1)

260 to replace one or both..?

zman187

I'm gonna throw this situation out real quick, hopefully someone can help. 0139 popped up about 2 years ago on my 2000 cali spec 5speed(I also have my own odb reader). I posted and someone replied saying I had to change the Rear o2 sensor on bank two(Red wire). So I did that and the code stayed. I was noticing extreme power loss as well so I assumed that my original maf was going bad so I ordered one up, put it on, power is back and light is gone. Now a couple days ago 0140 comes up. I haven't been on the org in a long time and noticed this thread and saw how big this problem has become. So I'm thinking I'm going to replace the Rear o2 sensor on bank 1(White Wire) let the car sit over night and have computer relearn sensors. I don't want to replace the bank 2 sensor again because a.)I just bought it two years ago and can't imagine its broken again and 2 when i took down the volt meter the white one was the only one a little out of the norm resistence. As well as the Black showing no resistence at all. I'm afraid to take it to the dealer because of the y-pipe. So I'm hoping I don't need to go and get computer reprogrammed.

Any help would be most helpful. Thanks

igzy

iTrader: (18)

For one only, dealer quoted $160 for part plus $100 of labor...

igzy

iTrader: (18)

If you got P0140, chances are that if you reset the battery overnight, it will come back on again after a few days, may be even instantly. I had P0140 and changed the sensor and reset the battery but it came back on again. Will be reprogramming the ECU next weekend most likely...

zman187

if i have the sensors changed myself will they reprogram with out doing sensors themselves? and with my y-pipe on?