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How to Test Whether an Oxygen Sensor is Good or Bad?

1 Answers

MacAdam

07/29/25 6:24pm

To test whether an oxygen sensor is good or bad, unplug the oxygen sensor connector and observe whether the engine fault disappears. Below is a detailed introduction to the oxygen sensor: Overview of the Oxygen Sensor: The automotive oxygen sensor is a critical sensing component in the electronic fuel injection engine control system. It is a key part in controlling vehicle exhaust emissions, reducing environmental pollution caused by vehicles, and improving the fuel combustion quality of the car engine. Oxygen sensors are installed on the engine exhaust pipe. Main Functions of the Oxygen Sensor: The oxygen sensor enables the engine to obtain the optimal concentration of the air-fuel mixture, thereby reducing the emission of harmful gases and saving fuel. By measuring whether there is an excess of oxygen in the exhaust after engine combustion, the oxygen sensor converts the oxygen content into a voltage signal and transmits it to the engine computer, allowing the engine to achieve closed-loop control targeted at the excess air factor.

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