I had a dumb. Replaced my O2 sensors and on the first drive the harness to the front one wrapped around the steering column and pullled the plug off of the car's harness. I want to splice it back together using the plug from Volvo's extension. There are four wires; 1 power, 1 ground, and two for the sensor heater. Colors from the cars harness are: brown, black, green/grey, and green/black. Does anyone know which wire is which? Thanks.