What is the normal resistance value of an oxygen sensor?

1 Answers
StKhloe
07/29/25 8:21am
The normal resistance value of an oxygen sensor ranges between 0.1 and 0.9. The fluctuation amplitude of the rear oxygen sensor is smaller than that of the front oxygen sensor. However, the values may vary depending on the brand, model, year, and emission requirements of the vehicle. It is essential to consider the specific vehicle model. The front oxygen sensor is installed before the catalytic converter and is used to adjust the fuel injection quantity. The rear oxygen sensor primarily monitors the performance of the catalytic converter. The detection method involves the engine control unit comparing the oxygen content measured by both the front and rear oxygen sensors. Under normal conditions, the signal from the front oxygen sensor is higher than that from the rear oxygen sensor. If the signals from both sensors are identical, it indicates that the catalytic converter has failed.
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