What is the best way to connect O2 secondary sensor to?

Since the ecu is P72 obd2a and cabin harness is 97 civic ex obd2a...

Im getting CEL 63 and sometime 65, that has do something w circuit heater wire..

I did put my secondary O2 on cat tho c clip pin onto ecu directly w 4 wires...what is best way to do secondary O2 sensor??

 

...What? You have an OBD2A ECU and wiring harness, why not just plug it in where it belongs?

 

Actually theres nothing I can find behind the cigarette charger/ cup holder..

I dont see any clip connector from harness for secondary o2

 

Just wire it in.

 

Actuallly already did that.. Did 4 wires directly to ecu pinout a6, d13, d14 and constant ground i believe.

 

What exactly are you asking, rereading through your first post confuses me terribly.

 

+1 you just confused the **** outer me

 

The secondary O2 sensor is wired to the EX dash/floor harness. There is no plug for the secondary O2 sensor on the engine harness.

 

Whoops sorry jbpnoman, I guess I missed the fact that he already has the cabin harness.

t-del28, the plug for the secondary o2 sensor should run through the chassis where the shifter is

 

My apologize for not be clarify, i meant i have same year 97 honda civic ex dash/floor harness.
Also, i was looking everywhere even by fuel pump area? I had this reason for power window.
...so its wires harness connect with obd2a P72 Ecu.

FYI OBD2a require primary o2 sensor AND secondary o2 sensor.

Like i said right now my secondary o2 sensor is on catalyic converter. The
4 wires is now through a hole between by shift linkage/airbag brain module.

 

I know, exactly because there is nothing from floor/dash harness and engine/trans.

Where is O2 secondary sensor connector?

 

it's part of the dash harness not the floor harness maybe if you gave us some more info like what year,body style and trim level your car started off as ? . the plug on a stock harness is located on the left of the lower center panel behind cup holders beside the srs module and there is a small jumper harness (flat 4 plug to square 4 plug) that goes between the 02 and the dash harness.

 

I still have no clue what you are asking? Is English your first language?

 

Check on the chassis over the cat. There should be a hole around the area where the shifter is. Based on what I've read, that's where the hole for the 2nd o2 sensor should be. The wire clip shouldn't be far from there. Hope that helps

 

yeah if it IS an ex dash harness then the plug should be hanging by the cat/shifter. just plug it in no wiring. im not sure why your even looking behind the cig lighter. under the car by the cat look around if you dont see it its either a different harness or the harness has been cut (not sure why someone would cut the secondary o2 sensor connector off though)