The O2 sensor is plugged into the header but I simply can't find a plug that comes from the harness that will match up. The car is a 96 CX with a p28 and a jumper harness. Right now i'm doing about 16 MPG and guessing that this is the culprit. How can I find the plug from the harness? The O2 sensor that is bolted up to the header is a 4 wire o2 sensor. Also, there is 1 cable that is a 2 wire (green and black) that is coming from the harness but it is cut. and another clip but it looks like a 3 pin. Any help would be greatly appreciated, my gas mileage is really suffering.