Veloce06

Just finished installing some OBX headers and y-pipe for my 02 Maxima. For the most part the install was pretty uneventful, but I did have to cut away a small section of the front motor mount, and to get the rear header installed I basically had to pull the rear motor mount out to get to everything.

Now that that part is done and everything seems to be lined up nicely, I'm wondering about the placement of the O2 sensors. I'm pretty sure the two secondary O2 sensors will basically go in the collector of each header where a bung is currently welded. They will both get anti-foulers installed with the sensors, however the rear header bung is too close to the heat shield protecting the steering rack, so the heat shield has to come off and I'm going to have to get a 90 degree anti-fouler.

Now for the other two sensors. Take a look at this picture:

Easy to see where the two secondaries go, but the two prewelded bungs for what I have to say would be the primaries is in the same exhaust pipe as the rear header. Their is one flat spot just after header collector and then one in the big "U" bend that then heads to the Y pipe.

So, will that work ok without any CELs or other issues? I would have thought they would have put one primary in the flat part of the front header just before the flange or something. Should have a new bung welded into the front header?

The Maxima exhaust has me really befuddled. The other cars I've worked on were rather straight forward O2 before cat, O2 after cat - same on both sides of exhaust banks.

Thanks for any direction you can give me.

Child_uv_KoRn

iTrader: (7)

No. Put the damn primaries in each header where they belong (1st bung on each header).
I assume they just added 2 more bungs wherever they felt like, so you can plug in the secondaries.

You will most likely get a CEL, so it doesn't matter. Either do the defouler trick or get an O2 sim.

edit: FYI for everyone as covered in other threads lol - DO NOT use the supplied gaskets. Use the OEM gaskets at the head and go find a high quality one for the other (I recommend copper).

george__

iTrader: (1)

^
aren't one of those holes for the egr port ?

Child_uv_KoRn

iTrader: (7)

Your troll level is....I'm not sure. You're persistent if nothing else.

colt149

iTrader: (1)

2002 Maxima have four oxygen sensor

Bank 2 (Front sensor 1 with blue wiring)=
Bank 1 (Front sensor 1 with black wiring)

You can use a nonfouler or 02 simulator to the two oxygen sensor
Bank 2 (Rear sensor sensor 2 with RED wiring with GREEN CONNECTOR)
Bank1 (Rear Sensor 2 with White wiring and BLUE Connector)

On your posted picture: Primaries but both on the same path
This is where you use the nonfouler.

dfj240

iTrader: (1)

You know, after coming back to this forum and seeing everyone give you hell, I thought, surely they're just giving him a hard time over a simple mistake or something, but this post clears all of it up.

So should I get a Gallo 12 or a Gallo 24 for my Maxima?

maximasicilian123

There's a few people that deserve a lil abuse on here but I haven't seen George bother anybody.

Fakie J Farkerton

iTrader: (51)

maximasicilian123

Ur the biggest retard on this site.with out a doubt.

Fakie J Farkerton

iTrader: (51)

Go crawl back into your hole and come back when you're ripe.

Veloce06

Ok so let me make sure I have this straight. Bank 1 is against firewall and Bank 2 is towards radiator.

Here's the picture again (labeled) differently:

In this picture A would be Bank 2 Sensor 1 and is considered the primary, upstream sensor. This should not have an anti-fouler installed.

B would be Bank 1 Sensor 1 and is considered the primary, upstream sensor. This should also not have an anti-fouler installed.

C and D would then be any combo of Bank 1 or 2 Sensor 2 and is considered the secondary, downstream sensor. These should have the anti-foulers installed.

Do I have that correct?

NmexMAX

iTrader: (22)

That's correct. I'd run it as is with no anti fouler and see if it trips a light. If it does, it's easy enough to add an anti fouler.

Children, behave otherwise

Brl24

^^Nailed it

Veloce06

Thank you! Your help has been great.

As it stands I'll probably have to pull the rear header anyways. I cannot find a way to get the O2 sensor installed in that bung. It is just too close to the steering rack and sway bar.

The_Fixer

iTrader: (1)

may I suggest just getting a 90* antifouler install it first then put the o2 in.it will save you the hastle later.

02whitemaximase

iTrader: (38)

Read my infallible thread. All of your questions regarding the sensors on the headers are answered.

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