Oxygen Sensor Female Wiring Harness Pigtail 4 way Connector, for Honda Civic SI, Honda CV-R, and Acura RSX Condition is New. Connector is for harness side connection. This connects to the wideband air/fuel sensor that you need for your 02-04 Acura RSX (DC5), 02-05 Civic Si (EP3), and 02-04 Honda CRV.