Hi just bought a new rear lambda sensor as my engine light was on. got under the car to change sensor and the wires had been cut prior to me bying the car. does any body know what the harness wires mean there is 1 red, 1 red/white, 1 brown and 1 yellow. the old sensor and new sensor has 2 black, 1 white and 1 blue. all threads say copy existing wires but with them being cut i cant

 

Did you buy an OEM O2 sensor or a generic?