How to Determine if the Oxygen Sensor is Faulty?
2 Answers
Increased engine fuel consumption and exhaust pollution, along with engine issues such as unstable idling, misfiring, and surging, indicate a damaged oxygen sensor. Here are some precautions for using the oxygen sensor: 1. Drive as smoothly as possible under normal conditions. Unless in emergencies or poor road conditions, try to minimize severe shaking and impacts to the vehicle body, and avoid scraping the undercarriage (especially near the exhaust tailpipe). The oxygen sensor contains ceramic sensitive elements, and severe shaking or impacts may damage these components. 2. Pay attention to the sensor wiring. During routine vehicle maintenance, avoid excessive pulling of the wiring. Like other electronic devices, if the wiring is affected, leading to unreliable connections, it may interfere with the normal operation of the oxygen sensor.
To determine if an oxygen sensor is faulty, you can pay attention to the following aspects. I usually enjoy studying vehicle data and found that the simplest method is to use a diagnostic tool to read the fault codes. If error codes related to the oxygen sensor, such as P0130 or P0171, appear, it’s a strong indication of a problem. Additionally, if you notice a sudden increase in fuel consumption by more than 15% while driving, or if the engine hesitates and jerks during acceleration, the sensor is likely the culprit. Another telltale sign is the exhaust—if it emits a strong rotten egg smell, it indicates incomplete combustion, meaning the sensor probably isn’t functioning properly. I experienced this myself when my car’s idle speed fluctuated wildly, and replacing the oxygen sensor immediately stabilized it. These signs are quite reliable when combined, but for a definitive diagnosis, it’s best to get a professional inspection.
