Hey guys, I have a 97 civic LX that originally came with the Y7 motor. I got a 2000 B18C swap last year, and the shop that did my swap re-used the stock wire harness. Anyways, the O2 harnesses needed to be extended to be long enough to reach the O2 bung of the OEM GSR header, and after the cat. (Yes, two O2 sensors, I kept it OBD2). I am getting terrible gas mileage even after a tune up and new primary O2 sensor. I have a feeling that the shop that did my swap may have reversed the O2 sensors, and put the primary after the cat, and the rear into the header bung.

So the help I need with you Y7 guys is to tell me the colors of the wires for the primary O2 sensor on the engine harness side. Thanks

 

 

Sweet, thanks man