How to Determine if the Oxygen Sensor is Faulty?

[MacSpencer]

Methods to determine if the oxygen sensor is faulty: Observe the color of the oxygen sensor's exterior. The normal color is light gray. If it appears white or brown, it indicates the oxygen sensor is faulty. Introduction to oxygen sensors: 1. There are usually two oxygen sensors. The one located in front of the three-way catalytic converter is called the front oxygen sensor, while the rear one is located behind it. 2. The front oxygen sensor is used to adjust the mixture concentration. 3. The rear oxygen sensor's task is to monitor the working condition of the three-way catalytic converter. Consequences of oxygen sensor failure: 1. Front oxygen sensor failure will prevent the mixture from being corrected, leading to phenomena such as decreased car power. 2. Rear oxygen sensor failure means it is impossible to determine the operating condition of the three-way catalytic converter. Once the three-way catalytic converter fails, it cannot be repaired.

[MacGarrett]

A few days ago, my car's check engine light came on, fuel consumption increased noticeably, and the car seemed sluggish during acceleration. After checking, I found out the oxygen sensor was faulty. I used an OBD scanner and got the trouble code P0130, confirming the sensor issue. Normally, I couldn't save on fuel costs even when driving on highways. After replacing the sensor, everything returned to normal immediately. I also tried testing the sensor voltage with a multimeter—under normal working conditions, it should fluctuate between 0.1 and 0.9 volts, but mine was stuck at 0.5, indicating failure. If not repaired in time, it could damage the catalytic converter, which would be even more expensive to fix. I suggest not delaying like I did—check the scanner for codes as soon as symptoms appear to save money and hassle.

[DeEliana]

Last month, my friend's engine suddenly shook violently at idle and nearly stalled on the road. After being sent for repairs, it turned out to be an oxygen sensor failure. Common symptoms of a faulty oxygen sensor include the check engine light staying on, black smoke or a pungent smell from the exhaust. If you notice your car struggling to accelerate or a sudden spike in fuel consumption, get it tested at a professional shop immediately. They'll use an OBD tool to read the trouble codes—quick and easy. Delaying repairs can lead to bigger issues, like an overly rich air-fuel mixture damaging engine components. This part is crucial as it controls the oxygen ratio in the exhaust. I recommend periodic vehicle inspections, especially around 100,000 kilometers when sensors typically reach their lifespan—replace them promptly for safety.

[SanNoah]

After using my car for several years, the fuel consumption increased from 7 liters per 100 kilometers to 10 liters. Initially, I thought it was due to improper maintenance, but later the mechanic detected a faulty oxygen sensor. When it malfunctions, it causes the engine to consume more fuel and results in jerky acceleration. Another obvious symptom is excessive exhaust emissions, with a strange smell when idling, somewhat resembling unburned gasoline. It's best to buy an OBD scanner to read the fault codes yourself. If the sensor isn't replaced, not only will you spend more on fuel, but you might also fail the annual inspection. Pay attention to these signs during daily driving, and timely repairs can save you trouble, money, and be more environmentally friendly.