hey guys i have just did a b16 obd-1 motor swap to my 89 crx si, and was wondering what this plug goes into? it is on the tranny side of the motor right below the dizzy

here is a picture of the plug

it has one yellow wire going to it.

 

That was for the 1-wire obd0 O2 sensor.

If you have converted to a 4-wire OBD1 sensor, then you don't need it. I have mine just hanging. You could also just cut it off since you are no longer using it.

 

thank you very much come again