feel stupid asking but i cannot find the sencondary o2 plug on my car. i am used to the plug being above the cat in the body. i have a 99 dx hatch with ctr motor using a extended ctr harness. wondering if anyone can help me out and point me in the right direction.

 

ttt

 

the secondary o2 sensor should be under the car right after the cat if you have a CTR or any engine that doesn't have the stupid cat attached to the header.

 

anyone else? please need some help.

 

come on somebody knows

 

The stock location for your Civic DX 2nd o2 plug is in the area towards the bottom of where your header is, or where the bottom of the factory Dx exhaust manifold/convertor is.

The factory location for the CTR 2nd o2 plug is actually under the passenger seat, and you can access from under the car by pulling the rubber grommet on the o2 wiring through the floor board.

So bascially the locations are in totally opposite areas on a DX vs. CTR.

What engine harness are you running?

*EDIT*

Looks like you have a CTR engine harness, which basically means that since the 2nd o2 plug is located on the chassis harness of a CTR then you do not even have a 2nd o2 plug now.

You will basically have to make one from scratch and route it however you want to.

 

running a a ctr harness. so its gonna be inside the car on the passenger side?

 

ok wireing it theres 4 wires, 2 black 1 white and 1 green. white i know goes to the ecu, the 2 blacks are heaters and need a 12v source, but i have no clue where the green one goes.

 

Update:

In my haste to reply while at work I was likening the CTR chassis to the Si/EX that we have here in the US, but in fact the CTR doesn't even use a 2nd o2 sensor at all so that's the obvious answer as to why you lack a plug for one.

As far as wire colors go, I'll be back tomorow after I can look through a service manual for wire colors, pins, etc.


Modified by B18C5-EH2 at 11:08 PM 6/19/2008

 

thanks man, ya i am trying to wire this so i can slap a 2000 si ecu in and get a inspection sticker.

 

ttt

 

nevermind i figured it out

 

man i am having the same poblem how did you fix it please help

 

please help

 

what year car,motor, and ecu u running

 

its a 99 lx 4 door and it has a b16a2 now and i used the stock b16 harness and the b16 ecu the car runs but has a code and i cant reg smog test every one told me that it but the shift i took it all apart carpet and nothing please help

 

please

 

so your using a jdm b16 swap and a 2000 si ecu? if so it def wont work cause of the crank sensor the si ecu looks for. let me know if your using a usdm or jdm ecu

 

its oem b16a2 off a 1999-00 civic si and i used the wiring that came with the engine and ecu the problem is that the SI come with a sub harness for the 2nd 02 and my car does not have it wht i am wondering is do you know how to spice the 2nd o2 straight in to the ecu thanks man

 

1-white- A23 (secondary 02 signal)
2-green-C18 (ground) 3-black-B1 (ignition power 12v) 4-black- A8 (secondary 02 heater)

clip
[1][2] thats looking down at your 02 connector
[3][4]

this should be it let me know if it doesn't work. #3 doesnt have to be b1 it can be any 12v source.

 

and if u dont know which connectors are A B or C, theres 4 slots on ecu 4th is empty thats D so to the left of D is C and so on. the the pins go left to right like for instance the A connector go's
1,2,3,4,5,6,7,8,9,10,11
12,13,14,15,16,17,18,19,20,21,22,23,24
25,26,27,28,29,30,31,32
i am sure u get the idea

 

thanks so much man you don't know how much i did to get this man your a life saver if ever in chicago i owe you one just pm me

 

haha will do man one day i might take u up on that offer, get off your trial membership.
names chris by the way

 

ya for sure man sorry i did get back to you but my 5 post were up lol

CHRIS thanks for the help man my names tony ya but when ever you come out man ill show you around here for sure dude is there any way to tell the blacks apart or just try them

 

as far as i know the blacks can go either way