What are the symptoms, causes, and troubleshooting methods for a faulty rear oxygen sensor?

[HavenAnn]

Symptoms of a faulty rear oxygen sensor: The malfunction indicator light will illuminate, the engine may shake, there may be popping sounds from the exhaust, a pungent odor may be present, fuel consumption may increase, and there may be a lack of power when climbing hills. Below are the causes and troubleshooting methods for a faulty rear oxygen sensor: 1. Causes: The main reasons for the aging of the rear oxygen sensor are excessively high local surface temperatures of the sensing element, leading to internal heating failure or failure of the oxygen sensor chip. Silicon dioxide generated from the combustion of silicon compounds present in gasoline and lubricating oil, as well as organic silicon gases emitted from improperly used silicone rubber gaskets, can cause the rear oxygen sensor to fail. 2. Troubleshooting methods: The performance check of the rear oxygen sensor is divided into three scenarios: first, detecting the sensor's resistance; second, measuring the voltage output signal changes of the oxygen sensor; and third, observing the color of the oxygen sensor's exterior.