What is the normal voltage range for an oxygen sensor?

1 Answers
VanParker
07/30/25 6:06am
The normal voltage range for an oxygen sensor is 0.1 to 0.9V, with an average value between 0.4 to 0.5V. Here is relevant information about oxygen sensors: 1. Working principle of oxygen sensors: They use ceramic sensing elements to measure oxygen potential in heating furnaces or exhaust pipes, then calculate corresponding oxygen concentration based on chemical equilibrium principles. This enables monitoring and control of combustion air-fuel ratio in furnaces, ensuring product quality and exhaust emissions compliance. 2. Oxygen sensors are installed before and after the three-way catalytic converter: The front oxygen sensor is called the upstream oxygen sensor, while the rear one is called the downstream oxygen sensor. The primary function of the upstream sensor is to detect oxygen content in exhaust gases, allowing the ECU to adjust air-fuel ratio based on its data; the downstream sensor's main purpose is to detect whether the three-way catalytic converter has failed.
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