high, was going to wire up a 3 wire o2 sensor in my truck, it has a 1 wire. what I was wondering does the 3 wire [94 model chevy pcm cut the power to the o2 sensor after it gets heated up or does it continue to supply 12 volts to the sensor.] my truck is a 91,my sensor is getting lazy and I found a 3 wire fore about the same price as a 1 wire. hope everones doing ok been busy.