THE BEECHMONT CREST AUTOMOTIVE LEARNING ZONE
OXYGEN SENSOR
The oxygen sensor is a sensor that monitors combustion efficiency by measuring the amount of oxygen released in the vehicle’s exhaust gases.
OBD II vehicles are equipped with at least two oxygen sensors (primary and secondary), located on either side of the catalytic converter.
The primary oxygen sensor is located in front of the catalytic converter. It monitors the oxygen content of exhaust gases entering the catalytic converter.
The secondary oxygen sensor is located behind the catalytic converter. This sensor monitors the oxygen content of gases leaving the catalytic converter.