What is the normal working voltage of the rear oxygen sensor?
2 Answers
The voltage range of the rear oxygen sensor is between 0.1-0.9V, with an average value typically around 0.4-0.5V. Here are the specific details about the rear oxygen sensor: 1. The rear oxygen sensor data is fed back to the ECU for comparison: The purpose of this data is to ensure the proper functioning of the three-way catalytic converter. 2. Every car is equipped with an oxygen sensor, which detects the oxygen content in the exhaust: The ECU compares the data from the front and rear oxygen sensors. If the data from both sensors is the same, the ECU will determine that the three-way catalytic converter has failed. The three-way catalytic converter purifies the exhaust, reducing pollutants in the emissions. 3. The oxygen sensor is not a component that can be used indefinitely: Prolonged use of the oxygen sensor can lead to carbon buildup and even lead poisoning. Therefore, the oxygen sensor needs to be cleaned or replaced regularly. If the oxygen sensor in a car malfunctions, it may result in increased fuel consumption and reduced engine performance.
As a car modification enthusiast, I often tinker with the vehicle's electronic systems. The normal operating voltage of the rear oxygen sensor typically fluctuates between 0.1 and 0.9 volts; ideally, it should oscillate around 0.45 volts, indicating that the engine is properly adjusting the air-fuel mixture. I've tested it on my own car using an OBD diagnostic tool—the smoother the voltage fluctuations, the better. If it gets stuck at a certain point, like consistently reading 0.1 volts or 0.9 volts without moving, it means the sensor is faulty, which could lead to increased fuel consumption or emission issues. During maintenance, cleaning the dirt around the sensor can extend its lifespan. Don’t forget that abnormal voltage can also affect the catalytic converter, making repairs more troublesome later. I always perform a quick data check during every service to prevent problems—saving both money and hassle.
