Where is the car oxygen sensor located?

1 Answers
DeMackenzie
07/29/25 7:57pm
Automotive oxygen sensors are divided into two types, front and rear, both installed on the engine exhaust pipe. The main functions of these two oxygen sensors are: 1. Front oxygen sensor: Detects the oxygen concentration in the engine exhaust gas and then transmits the obtained information in the form of an electrical signal to the ECU. The ECU uses the oxygen concentration information to perform feedback control on the air-fuel ratio. 2. Rear oxygen sensor: Detects the oxygen concentration in the exhaust gas after it has been purified by the three-way catalytic converter. If the oxygen concentration data obtained by the front and rear oxygen sensors are the same, it indicates that the three-way catalytic converter has failed. Additional information: If the car oxygen sensor malfunctions, the computer of the electronic fuel injection system cannot obtain accurate information about the oxygen concentration in the exhaust pipe, and thus cannot perform feedback control on the air-fuel ratio. This will result in increased fuel consumption and higher emissions from the engine.
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