o2 Simulator Connector Chart

You want to match your o2 sensor end to one of the connector types on this chart. You will unplug the sensor from the wiring harness and plug the simulator into the wiring harness. If you no longer have your sensor, you want the simulator to be the opposite of your wiring harness. Types 1 and 3 are female connectors (have the holes for the pins), types 2 and 4 are male connectors (have metal pins down inside the tube). On types 2/4 pay attention to the plastic guide(s) inside the tube between the pins. Type 2 has a guide on one side, type 4 has guides on each side between the pins.