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What is the normal resistance of an oxygen sensor?

1 Answers

ChloeFitz

07/30/25 1:05am

Automotive oxygen sensors typically have a resistance value ranging between 4-40Ω. The fluctuation range of the rear oxygen sensor's resistance value is generally smaller than that of the front oxygen sensor. However, the resistance value may vary depending on the brand, model, year, and emission requirements of the vehicle, so it's essential to refer to the specific vehicle model. Correct method for measuring oxygen sensor resistance: Start the vehicle, and after the engine reaches normal operating temperature, disconnect the oxygen sensor's wiring connector. Use an ohmmeter to measure the resistance between the sensor's terminals. The measured resistance should comply with the standard value specified for the particular vehicle model (generally 4-40Ω). If it does not meet the requirement, the oxygen sensor needs to be replaced. The oxygen sensor is a standard component in automobiles. It utilizes the Nernst principle, employing a ceramic sensing element to measure the oxygen potential in the vehicle's exhaust pipe. The corresponding oxygen concentration is calculated based on chemical equilibrium principles, thereby monitoring and controlling the combustion air-fuel ratio to ensure that the vehicle's exhaust emissions meet standards. Oxygen sensors offer advantages such as simple structure, rapid response, easy maintenance, convenient use, and accurate measurement.

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