I got a 96 Honda Civic Cx hatch. Im using a 98 Honda Civic Ex Wire harness. It only has one a plug for the primary O2 sensor. Im trying to figure out the easy way to wire the second O2 sensor up. I using a 98 gsr ecu.

What does each wire on the o2 sensor stand for and where on the ecu should I tap it in to.

Green -
White -
Black -
Black -

 

ok , I figured out that

green = ground for the O2
white = signal for the o2
black = power for heater element
black = ground for heater element

 

how i just need to know which pins on a 98 gsr ecu that would go to

 

the problem is that the secondary o2 plugs into the vehicle harness not the engine harness.

 

yeah but it's has to go the ecu some how..

 

well the 98 gsr computer is OBD2 so it has to be pre wired to accept a secondary o2 obviously, and your car is an obd2 car. So you should have the plug there, and everything should be plug and play if you have and OBD2a to OBD2b conversion harness.