How to Measure the Condition of an Oxygen Sensor?

1 Answers
LaBrody
07/30/25 9:51am
Oxygen sensor measurement methods are as follows: 1. Unplug the oxygen sensor connector; 2. Use a multimeter in resistance mode to measure the resistance between pins 1 and 2 of the sensor; 3. A resistance value between 4 and 40 is normal, while an abnormal value indicates a damaged oxygen sensor. Types of oxygen sensors include: standard oxygen sensors, air-fuel ratio sensors, and nitrogen oxide sensors. The working principle of an oxygen sensor is: using a ceramic sensing element to measure the oxygen potential in a heating furnace or exhaust pipe, then calculating the corresponding oxygen concentration based on chemical equilibrium principles to monitor and control the combustion air-fuel ratio inside the furnace, ensuring product quality and compliance with exhaust emission standards.
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