Plug and play. Just assume the 300zx's connector is the same as the stock CA18DET's connector. Different colors, same funtions in the same spot.beans33 wrote: Ok ive searched and still not able to find much help. i got a brand new 300z o2 sensor, which has the three wires. ( blue , black , black ) on my ca harness i have three wires that are (blue , black , brown) Can someone tell me whick wires goto each other. thanks..