i removed this 02 sim off the car. I can assure that the 02 sim is in perfect working order. If you install at the ECU box, you dont need to extend any wires. I dont know why most people dont do it that way.
this will 99% solve your problem. (depends on what the problem is with your sensor, if its the heater circuit, this wont help, if its getting bad readings cuz the sensor went bad, this will solve your problem)