Trying to figure out what wire colors are what in my 95 legacy with respect to the rear oxygen sensor. I have seen 2 different conflicting schematics (one in a chilton, another in mitchell repair program) and need to figure out which wires are which.

 

This is what I have

 

From ECU ------------ Cable to O2

 

Pin 1 - Wht/Blu - Wht/Blk Yel/Red - Pin 1

Pin 2 - Yel/Red - Yel/Red Wht/Blk - Pin 2

Pin 3 - Wht/Blu - Blu Blu/Wht - Pin 3

Pin 4 - Black - Blu/Wht

 

Within the cable from the engine compartment to the o2 sensor, pins 1 and 2 switch position and the Blu and Blu/Wht wires are spliced together. My O2 sensor has 2 white wires (presumably heater) and a black wire (sensor).

 

The Yel/Red wire has +12V so I know this attaches to one of the white wires (as far as I can tell it doesn't matter which one). The only thing I don't know is which wire is the Heater Ground and which is the Sensor Wire.

 

Thanks for any help

In addition, I have no idea if any work/rewiring has been done to this in the past so the pin numbers may not be stock :-\