If I were to have the y7 harness, is there a plug for the secondary O2? or is there only one in the y8 harness? If I have the y7 harness do I have to manually wire into my ECU the wires for the secondary O2? How do I know which Harness I have in my car? I bought it the way it is, with the secondary o2 sensor as a CEL. Let me know, thanks in advance!!!!! 1997 Civic Hatch, Dx d16y7/y8 head 112k miles.