Nissan Repair: 02 sensor, nissan avenir, oxygen sensors

Question
Hello to you fine people , was wondering if My Nissan Avenir sulut-x 2000 has a Titania 02 sensor 3 wires if not could you help Me out with what it is I have ???

Answer
Chris,

A three wire oxygen sensor is basically a heated oxygen sensor.  Oxygen sensors are self generating but they have to be hot to work.  The other two wires heat the sensor so it can control the exhaust mix sooner rather than wait until the car reaches operating temperature.  The usual thing that fails is the sensor itself and since yours is over ten it is overdue for replacement.  If the sensor is replaced and the heat circuit shows a fault for the sensor it is the timed relay that controls the electricity to the heater circuit.