So I got a 2000 civic ex coupe, the auto + d16y8 blew, so I picked up a y7 with manual swap for it, managed to get it running with my obd2b harness , but I realized that I have to extend the oxygen sensor wires cuz the cats are in different places, but my obd2b harness is missing the pigtail all I have are some wires where I believe the plug should be, one of the wires is thick grey with wire strands right underneath the sheathing, also a green wire an 2 others, basically I’m just looking for the wire colors for the sensor 1 on a obd2b engine harness, thank you

 

The thick grey wire, as you put it, is actually the outer covering for the shielded O2 signal wire. Inside, should be a white wire. It may have a red stripe on it. The other three wires should be a green/white (or green/black), and yellow/black, and an orange/black.

 

thank you so much man, been trying to get this things all sorted to get back on road an this is 2nd to last thing, GREATLY appreciated!!!