also i found this The Up-Stream Sensors are the same ( OBD I Vs. OBD II ). The plugs are not the same. The OBD I style plug is a simple 4 pin rectangular connector, as the OBD II plugs are ''D'' Shapped color coded connectors ( Brown or Black ). You can swap the plugs by removing the wires from the connector. Take in account that if you choose to use the OBD I sensor, you should only use it for pre-Cat ( up-stream ). Normally we put in OBD I O2 sensors on OBD II VR6' because they are cheaper and the OBD I type sensor has a longer wire, thus making wire routing easier. To acheive this, we simp