What are the symptoms of a faulty front oxygen sensor in a car?
1 Answers
Once the oxygen sensor or its connecting circuit malfunctions, it will not only cause excessive emissions but also deteriorate engine performance, leading to various issues such as stalling at idle and irregular engine operation. Below is a relevant introduction: 1. Oxygen Sensor: In engines equipped with a three-way catalytic converter to reduce exhaust pollution, the oxygen sensor is an essential component. Since the purification capability of the three-way catalyst for CO, HC, and NOx drops sharply when the air-fuel ratio deviates from the theoretical value, an oxygen sensor is installed in the exhaust pipe to detect the oxygen concentration in the exhaust. 2. Oxygen Sensor Signal Voltage: The signal voltage of the oxygen sensor, as the most direct data reflecting the air-fuel ratio condition, is a crucial reference in fault diagnosis. In closed-loop operation, the working voltage of the oxygen sensor typically ranges from 0.1 to 0.9V. Usually, maintenance personnel use an oscilloscope to test or read the corresponding data stream with an electronic control diagnostic tool.