Where is the oxygen sensor located on the Mercedes-Benz Vito?

1 Answers
SanEllie
07/30/25 1:10am
Oxygen sensors are actually divided into two types, front and rear, both installed in the exhaust pipe of the engine. With the three-way catalytic converter as the boundary, the one before the three-way catalytic converter is the front oxygen sensor, and the one after is the rear oxygen sensor. Function of the front oxygen sensor: It is used to detect the oxygen concentration in the engine exhaust and then transmit the obtained information to the ECU in the form of an electrical signal. The ECU will use the oxygen concentration information to perform feedback control on the air-fuel ratio. Function of the rear oxygen sensor: It is mainly used to detect the oxygen concentration in the exhaust after purification 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.
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