Technician A says that oxygen sensors can have one, two, three, four, or more wires, depending on the style and design. Technician B says that if the exhaust has little oxygen, the voltage of the oxygen sensor will be close to 1 volt (1000 mV) and close to zero if there is high oxygen content in the exhaust. Which technician is correct?
A) Technician A only
B) Technician B only
C) Both technicians A and B
D) Neither technician A nor B

Question

Quizplus · Accepted Answer

Technician A is correct in stating that oxygen sensors can have different numbers of wires depending on the style and design. Some may have one wire while others can have up to four or more.
Technician B is correct in stating that the voltage of the oxygen sensor will be close to 1 volt when the exhaust has little oxygen, and close to zero when there is high oxygen content in the exhaust. This is because the oxygen sensor's primary function is to measure the amount of oxygen in the exhaust and adjust the air/fuel ratio accordingly. As the oxygen content changes, so does the voltage produced by the sensor.

Technician a Says That Oxygen Sensors Can Have One, Two