Okay...so I need a PRIMARY oxygen sensor for my 2k2 max...its the baby blue connector under the engine bay....it's about $110 shipped OEM from DaveB....but I wanted to flex my options before jumping into a buy

I have cattman headers and the stock OEM PRIMARY o2 length isn't long enough to reach the bungs....is there a way to get around this without extending the wires? Like I was wondering if they sell direct bolt on o2 sensors that have long enough wires....I'm looking for the PRIMARY ones...

Walker, Warner, Bosch? Any input would be appreciated! Thanks

 

Oh yeah, how about the universal ones? Do they work okay? I have to reuse my old baby blue connector though right? just crimp the wire to the connector and plug it in?

 

Yeah man, Ive got the same problem. I have a P0138/P0139 Code right now. Ugh. From what Ive heard dont go universal. Ive asked around and Bosch seem to be great.

 

I'm actually gettin the 0152 code which is Primary o2 high volts...

the 0138 is actually secondary o2 high volts....try out a simulator for $30 and that should solve it...you'll never have to worry about secondary o2's failing becuz u simulate the wires BEFORE the connector (EGI harness side)...

 

So I need a downstream sensor right? Is it the one after the Cat? Sorry for whorin your thread steven.

But, I am going with Bosch. They arent that expensive.

 

no problem...that is correct...the one AFTER the cats...its also called DOWNSTREAM aka SECONDARY....how much are you getting your bosch? i know 2k-2k1 sensors are a little bit cheaper than 2k2-2k3

 

Does anybody know if 2000-2001 Primary o2 sensor would work on my 2002? I heard 2000-2001 Primary wires are naturally longer than 2002...that might benefit me cuz it will reach my cattman bung easier...

 

I replaced my bank 2 primary/upstream O2 with a Bosch universal, and it has been working great, I think it was around $55.

 

Hey Frank, how hard was the installation? And you had to reuse your stock connector correct? I want to try out the universal ones....hopefully I can order one thats already longer in wire length than my stock...cuz cattman bungs sit alot lower than stock header bung...so I need that extra wiring length...I don't wanna buy a new OEM and hack it up to extend the wires u know?

 

I believe the wires "pigtail" onto the sensor. Installation is easy provided you have the tools. You need a special socket for the sensor, well you dont "need" one but it sure makes it a hell of a lot easier.

Go here...

 

removing the sensor is not a problem...i already have the special socket to remove it from the bung...my only concern is installation of the sensor....a universal one that is

can you elaborate more on the "pigtail" of the sensor?

 

Pigtail means it just sticks onto the back of the sensor. I think the wires are in a pigtail they just snap off the back of the sensor...I think...

Im going off what one of my friends told me, he replaced his O2 sensor last week...

 

Mine isn't burnt

Well, you can get some wires and start soldering - that would work.

I'm sketchy about universal ones tho.

 

http://cgi.ebay.com/ebaymotors/NEW-B...temZ8046681472

anybody know if this would work? Its listed as a SECONDARY 4 wire o2 sensor...i know our PRIMARY is only 3 wires...is it possible to hook this up and not use the 4th wire? reason why i want this is becuz the SECONDARY is longer in wire length than my primary...so it would go well with my cattman bung

what exactly are the 4 wires for the secondary? and what are the 3 wires for the primary?

 

same here universal bosch for 10 months with no prob.

 

where are you guys getting it from? oxygensensors.com?

do they give discounts>?

 

I got my O2 sensors from there also. Automedicsupply/oxygensensors.com. I bought the walker oem replacement. My friend used the Bosch universal ones and they worked just fine. You just have to crimp it with the stock wires.

 

I bought the walker universals and my car has been fine ever since. I had to replace the bank one and bank two sensors. all you do is cut the old wire and splice into it. Very ez to do and saved me alot of money.

 

I got mine from pepboys, and I would only use a primary, the primary I replaced, had a heater element in it, I know the primary/upstram readings are used to adjust the fuel trim, where as the secondary/downstream just give you a reading of the efficiency of your Cat.
The wires on mine were really long, your supposed to cut them to the length desired, them they have this fancy box shaped butt connector that you use to connect the wires in a relatively secure watertight manor to your old plug, so if you leave alot of wire connected to your old plug before joining the two, I am sure youll have enough slack in the wire.

 

My understanding is that the 4 wire versions are virtually the same as the 3 wire.

The difference is that the signal now has a pos and neg, as opposed to using the body of the sensor for ground.

 

im pullin a p0138 code i read the tsb and it says you have to reprogram the computer after you change the sensor... ive called three nissan stealerships in my area on computer reprograming and the cheapest one said 90$.. are you guys doin this or are you just changin out the sensor and not reprogramming? i dont wanna have to do it if i dont gotta.

 

I never did the reprogram, just cleared the codes with and OBDII

 

my 01 has four sensors and I'm in need of replacing two, got a p0174 code and apparently its running lean. I want to replace ALL sensors just to be safe...planning on buying it from Ebay seller http://search.stores.ebay.com/GLOBAL...271212QQsofpZ0 because the universals are so cheap...now do I need 2 of the 3 wire and 2 of the 4 wire? I've been trying the search and found a diagram but it doesnt say how many wires each sensors have...

 

Don't really know if thats a good idea or not.

3 wire sensors have ground, power, and the signal to the ecu. The extra wire on the rear sensors is the heated wire (heats the sensors for some reason, maby to warm the cats). Other than that the other 3 wires do the same as the front sensors.

EDIT:I may not know what I'm talking about, this pic says they are all heated. I thought the rear sensors were the only heated one's


check here for some options on sensors. Some may have longer wires
http://www.rockauto.com/catalog/raframecatalog.php

 

The rear 2 sensors have 4 wires and the 2 front have 3 wires

Here is some helpfull pics

 

thanks for those pics and info....just bought 3 and 4 wire sensors on ebay

 

FYI
in the future, buying from daveb is the best way

 

www.ngk.com

I got my 4 from here and quite easy to replace. Going strong with 50K on them.

 

Great price at that ngk.com site. They even come with the OEM plugs. I was thinking about doing the universal thing, but at those proces I may go with them to avoid the hassle of splicing wires.

 

True, someone on this forum actually recommended the site. NGK sensors come with the end connectors, no splicing etc. Just remove the old one and plug in the new ones.

 

Keep in mind you should never solder o2 wires. Don't ask why I don't know the specifics but this is what they teach mechanics. Bosch seems to have a really good kit with crimpless connectors and a nice waterproof housing for the connectors. You can set the length of the wires as it comes with way too much for every application I've seen. I don't know if it's true but bosch claims their sensor is better than other brands. I used it on two of my hondas and never had any problems.

 

oem is bosch

 

Just to make sure. A p0138/p0139 code error is for the secondary 02, oxygen sensor 2 in bank 1. Thats all the info I need to purchase the 02?

 

I am getting the PO138/PO139 codes also. For a 2000 model I think that means changing the rear O2 sensor. I wanted to change the rear O2 sensor with the NGK kind, too. I could see how to disconnect the sensor from the pipe behind the cat but it looks like the other end of the wire goes up into the floorpan of the car. Do you mind a brief description of how to remove and replace this ?

Thanks,

 

BW_Max2K_SE - I've got the same problem on mine

 

I just figured i would put my 2 cents in... for anyone who cares

I had the Bank 2 sensor 1 code. (front primary)
The sensor itself got damaged by my hotshot headers cause it hit the alternator.
I finally decieded to fix it.(new sensor and relocating the bung so it would not hit) I bought the NGK sensor from their website.
I am Impressed with the quality. It appears to be MUCH better quality than the OEM sensor. The wires seem to be a slightly more durable, shielded all the up, and where the wires attach to the sensor much better quality. and plugged right in... all for $106 shipped to my door...(cheapper than Dave B )

 

To all with the dreaded PO138/PO139 code for the 2000 Maxima this is the one and (only) rear O2 sensor. I know I supposed to be able to find all this on the sticky notes BUT THE LINKS ARE BROKEN ! This has turned into a totally dysfunctional site. For the record the NGK sensor is working fine.