So as the title states I have a 1996 Civic coupe with a 1997 HX D16Y8 swap in it. It currently has a P2N ECU in it and the Primary O2 sensor does not read at all. I used a Determinator Scanner and using Data Stream I can see that the O2 voltage is always on 1.06 and doesnt move from there. I have double checked that the pins on the ECU are in the right spot, have checked to see that the wire isnt cut, and have check that the grounds and stuff are all good. Can't seem to find the problem and the gas mileage is HORRIBLE. I have been reading that HX engines are suppose to have a 5 wire O2 harness but mine only has 4 wires 2 heater wires, 1 ground for the O2 and 1 O2 signal wire. Can anybody help me out on this. Thanks in advance.