[theFREAKnasty82]

Oxygen sensors are supposed to vary their voltage between 0.1 volts to 0.9. Your sensor is stuck reading a specific voltage and not fluctuating. with 69,000 miles on it, it's not widely told, but it's good practice that @ 50,000 miles, the oxygen sensors are supposed to be replaced. The heat wears them down and causes them to act funny more down towards the road.