What are the symptoms of a bad oxygen sensor?

[EmmaRose]

There are several symptoms of a faulty oxygen sensor: 1. Heating function failure: If the oxygen sensor's heating wire breaks or there's an issue with the heating circuit, the heating function will malfunction, causing the ECU to report a fault code. 2. Oxygen sensor ceramic breakage: If the zirconia ceramic is damaged, the only solution is to replace it with a new one. 3. Oxygen sensor poisoning: This type of fault mainly occurs when harmful substances in the exhaust gas or carbon deposits accumulate on the ceramic body of the oxygen sensor, leading to inaccurate signals. This is usually caused by using low-quality gasoline or poor-quality engine oil. Since the crankcase ventilation system allows a certain amount of oil to enter the engine combustion chamber, some inferior oils contain harmful additives that appear in the exhaust gas and affect the oxygen sensor. In such cases, cleaning the oxygen sensor can restore its performance.