Where is the car oxygen sensor installed?

1 Answers
LaOlivia
07/30/25 8:37am
Location of the car oxygen sensor: one is located behind the exhaust manifold, and the other is behind the three-way catalytic converter. The oxygen sensor behind the exhaust manifold is called the front oxygen sensor, while the one behind the three-way catalytic converter is called the rear oxygen sensor. The oxygen sensor can detect the oxygen content in the exhaust and then feed the data back to the ECU, which can adjust the air-fuel ratio based on this data. The faster the voltage frequency of the oxygen sensor changes, the better the sensor is. If the voltage is 0 millivolts or 1 millivolt or even does not change, it indicates that the oxygen sensor is severely aged and needs to be replaced in time. Under normal circumstances, the signal of the front oxygen sensor is higher than that of the rear oxygen sensor.
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