Installing an O2 sensor, plese help!!

[Boricuanology]

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Ok guys so I know i have to install a o2 sensor which I did since I got one from advance that cost me $77, now my question is, My downpipe has two 02 sensors bug,
Do I need to install two of them, one that suppose to be the factory one (the one I just bought) and another one for tunning? or the one that I got in advance be good enought for the tunning?

Also is the one that I got in advance good enougth or I should have got a better one? I just got it as a factory replacement one.

 

[Almighty-Si]

The one you got isnt good enough for tuning. You will need a wideband 02 for tuning your motor.

 

[toneekay]

most newer cars have O2 sensors before and after the cat. i personally would just have one after the cat and plug the one before it up.

 

[Jas0n]

^^^^^ yes what he said, and for tuning you'll need a wideband 02 sensor, controller, software, chipped, or flashed ecu, ETC

 

[djrenok]

on 99 civic ex's dont they have two 02 sensors??? So the area between the outlet and the end of the piece theres an 02 bung on the other side. is that legitamite to use that stock bung on there??? Check it out

 

[d16_turbo]

^^^^ The Picture You Posted Looks Like A Dsm O2 Housing

 

[djrenok]

yeah it is......Can i run that on my civic, cuz i also have a Stainless DSM flange that i can weld my own downpipe to.....I just figured i can use that and run my downpipe to the bottom of that 02 housing....is that possible???

 

[lkailburn]

yes you can put the o2 sensor in the o2 dsm arm. it's a bit close for my tastes (too close the turbo and you risk overheating the sensor) but i suppose that's how dsm run them so

-Luke

 

[djrenok]

Yeah thats what i was thinking......I dont want to burn threw it. Should i plug that O2 bung up and drill my own or would u recomend just using that. and with OBD2 cars doesnt it have (2) O2 sensors??? I read that on a forum somewhere.......What would u guys do in this situation, run the stock O2 port or make my own????

 

[djrenok]

and im in search for a downpipe to hook up to the O2 housing and a compressor j-pipe if anyone has one....or know where to get one

 

[vtec95civicsi]

if you get a tune with hondata you dont even need a o2 sensor.

 

[djrenok]

yeah dont have those kinda funds at the moment or else i would. what would be my best bet at to what i already have.......what would be a better setup, run the 02 sensor off the DSM 02 housing or make my own on the DP....and again dont OBD2 hondas have two 02 sensors in the exhaust, one on the headers and one in the exhaust>??? or am i wrong.

 

[d16_turbo]

with crome pro you can turn the stock o2 sensor too

 

[djrenok]

Does 99 civic ex's have two o2 sensors?

 

[Almighty-Si]

Does 99 civic ex's have two o2 sensors?

Yes but if you convert to OBD I, you can just pull the secondary 02 sensor out since they never used 2.

 

[lkailburn]

what management are you going to be running? stock obd2 checks for 2 sensors, obd1 checks for 1. with any decent ecu management you can choose to run in open loop which basically tells the ecu to not look for an o2 sensor.

-Luke

 

[caddy]

most newer cars have O2 sensors before and after the cat. i personally would just have one after the cat and plug the one before it up.

I think you mean only one before the cat. That one is used for the air/fuel calculations, the o2 after the cat is only a check sensor to make sure the Cat is doing its job.

 

[djrenok]

So if i have a 16g turbo and i have a DSM 02 housing with the 02 sensor right on the 02 housing and is like 4 inches from the exhaust outlet.........Would u suggest me using that port, ( i was affraid it might get to hott there) where would be my best place to plug my 02 sensor, on the 02 housing or plug that one up and fab one into the downpipe? would it matter?

 

[djrenok]

it looks like this