Supermax95

iTrader: (2)

Do 00 Calispec y pipes have 2 or 3 O2 sensors??

Jeminunguy

it has four o2 sensors

Supermax95

iTrader: (2)

In the y pipe??

oldngivout

iTrader: (8)

Two are in the front pre-cat, or Bank 2.

Two more in the y-pipe which contains the rear pre-cat, or Bank 1.

Supermax95

iTrader: (2)

so a calispec y pipe needs 2 or 3 plugs for an o2 sensor? Reason i am asking is becuase i went under my friends 2000 and there were 3 o2's on his y pipe.....one on each end that goes into the EM's and one more in a precat, I was trying to put in a cattman ypipe that came off of my 99 but this pipe only has a place for 2 sensors and i was under the impression that it would work...The pipe looks like it would line up....is it possible to just put in a hole/thread for another o2 sensor in the middle of the pipe, or would the car throw a code?

oldngivout

iTrader: (8)

If you remove a pre-cat and do not put an O2 simulator in the new pipe, you will set a code. Merely placing an O2 sensor there will not work, because it's job is to report on the function of the pre-cat, which would now be missing.

Hope that makes some sense.

Supermax95

iTrader: (2)

So how would i install a y pipe on a 2000 calispec maxima without getting a code when the y-pipe itself has a cat in it.

nicks79

iTrader: (4)

O2 simulator.....

Supermax95

iTrader: (2)

Do i use a resister or something?? what kind?

sloppymax

iTrader: (8)

the aftermarket y pipe (cali spec) will remove one precat but will not trip a cel. i had one for 2 years and did not trip it. headers are a different story all together but you do not need an a simulator or resistor to mock the heater for an aftermarket y pipe for a cali spec 00/01.

Bollwerk

iTrader: (1)

Beware that there are no exhaust modifications that are CARB certified for the Maxima (regardless of year). You may still pass smog checks though. Just FYI.
http://www.arb.ca.gov/msprog/aftermk...es/amquery.php

Supermax95

iTrader: (2)

so a 00/01 calispec y pipe should have three places for o2 sensors right? Cuz i tried putting in a ypipe from a 99 calispec on a 00 calispec but the 99 had two places for o2 sensors and there were three in the stock y pipe.

sloppymax

iTrader: (8)

cali spec will have two primaries in the exhaust manifolds and two secondaries in the y pipe. the fed spec has two primaries in the same location but only one secondary that is mounted after the catalytic converter.

Supermax95

iTrader: (2)

see thats what's confusing me.....i know it should have 2 in the y pipe. But my friends 2000 calispec has three in the y pipe(one extra one in a precat)....

nicks79

iTrader: (4)

thats how it should be. in Cali spec there is 3 O2 sensors. two of them are secondary. one of them is primary for the back bank od cylinders.
So you are not confused. I suggest look it on the diagram..

Supermax95

iTrader: (2)

So why does my "calispec" y pipe have a space for 2 o2 sensors??

nicks79

iTrader: (4)

Is it the OEM y-pipe you talking about ? The OEM CAli spec y-pipe has 3 holes for O2 sensors.

I am thinking of getting an aftermarket one, and I only see two holes for O2 sensors as you said. Basically there is missing hole for back downstream sensor. I think you need to relocated it behind the main cat, or just don't plug it in, since you will have O2 sim anyways..
thats what I plan on doing, just coil it up somewhere by the firewall.. I think its designed based on Fed spec.

Supermax95

iTrader: (2)

Let me try to explain my predicament a little better, there seems to be a lot of confusion. I have a calispec cattman aftermartket y pipe. It has places for two o2 sensors. The y pipe currenlty in my 2000 calispec car has spaces for 3 o2 sensors.....how would i go about putting in the cattman y pipe when i need to put in 3 sensors but only have a place made for 2....

nicks79

iTrader: (4)

Ok, one more try.
1) I assume your Cattman y-pipe doesn't replace front precat. For that you will need headers or get OEM Fed Spec exhaust manifold. Your primary left bank O2 sensor will not move, means it will stay where it is now, which is in the front precat, visible from under the hood.

2) Your right primary O2 will be replaced by your cattman y-pipe. You need that one, can't drive without primary O2 sensors. You will screw it into the cattman y-pipe.

3) Your secondary Left O2 sensor will go in the second hole in the cattman y-pipe. However, you will need to install O2 simulator, or you will get P0430 code.

4) You do not have a hole for secondary Right O2 sensor. You have two options, either to relocate it behind main catalyst, or use O2 simmulator and leave it dangling neatly somewhere. Do not unplug it, because it will throw a code, since it is a heated O2 sensor. I think O2 simulator option here is cheaper and easier.

Thats my $0.02

Supermax95

iTrader: (2)

Okay thanks nick.....I just thought that the cattman y pipe would be plugg and play, i guess i was wrong...thanks!

Supermax95

iTrader: (2)

Why would that trip a code, its before the precat that is being removed....

foodmanry

iTrader: (15)

If you are replacing the y-pipe only it will remove the rear (bank 1) pre-cat which will NOT AFFECT THE CEL light. However, if you install aftermarket headers (removes both front and rear pre-cats) it will THROW A CEL LIGHT.

This is irregardless cali-spec or fed-spec.

Supermax95

iTrader: (2)

Thanks for clearing that up.....I never said one word about aftermarket headers.....But one thing is your answer was wrong. There is an O2 sensor in the rear precat, and the calispec doesnt have a place for that o2.(so i'd need a simulator). If i just replace the y pipe for the cattman without worrying about that o2 sensor i will trip a cel.

sloppymax

iTrader: (8)

i cannot think of one single member that needed an o2 simulator for an aftermarket y pipe (3.0 cali or fed spec) unless they had a bad secondary sensor and they were installing the simulator at the same time as the y pipe.
edit-i just checked my oem y pipe (01 so obviously cali spec) and it has 2 o2 bungs in it. hence why the aftermarket y pipe has 2 bungs in it

Supermax95

iTrader: (2)

i think my 2000 is just a freak......I'll take pics of the stock y pipe when i get it out.