Hi, im David im new here on h-t i recently got a 1991 honda civic hatchback with a ls swap from a 90 integra. My problem is that the O2 sensor in screwed into the header but i have no idea where the wire goes to? If it helps i believe it is the car's stock wiring harness. Can someone tell me where to plug the O2 sensor, it is a 1 wire type and the car is OBD0 with a pr4. So please tell me where the o2 sensor wire goes to. Pics would be great if possible and yes i have tried to search threads for hours. Thanks

 

The wire goes directly into the wiring harness, through the firewall on the passengerside, into the footwell, and plugs into the ECU there.

 

Before that though it goes into another clip that should be on the trans, or near.

 

Thanks everyone that helped but if i cant find the plug can i just go directly to the ecu plug find the pin for o2 sensor and then splice a new wire and run it to the o2 sensor?

 

You can, but why can't you find the plug? Where is the current o2 connected to?

 

its a round one wire plug kind of a greenish colored plug larger than average

Addon: The wire is white and just incase for some reason it is gone its pin c16

 

i couldnt find it because it was not connected in the first place and then i couldnt find any plug that wasnt used so i guess ill have to just run it from the pin c16. Thanks

 

look good under your dizzy sometimes it can get tucked away up there