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How to Determine if an Oxygen Sensor is Faulty?

2 Answers

DeViolet

07/24/25 11:29pm

Cars with a faulty oxygen sensor exhibit the following symptoms: 1. It can lead to a reduction in the vehicle's power performance and a significant increase in fuel consumption. 2. It may cause rapid damage to the car's three-way catalytic converter, greatly reducing its service life. Below is some relevant information about automotive oxygen sensors: 1. The oxygen sensor is an essential component for the engine to reduce exhaust pollution. Once the air-fuel ratio of the mixture deviates from the theoretical value, the oxygen sensor detects the oxygen concentration in the exhaust and sends feedback to the ECU. This feedback controls the fuel injection amount of the injector, thereby maintaining the air-fuel ratio of the mixture within the normal range. 2. The oxygen sensor calculates the oxygen concentration based on chemical equilibrium to monitor the air-fuel ratio of the mixture. Therefore, if the oxygen sensor is faulty, it cannot monitor the vehicle's exhaust emission values. The core component of the oxygen sensor is a porous ZrO2 ceramic tube. At certain temperatures, high-concentration oxygen molecules inside the tube can be adsorbed to form electrons, creating a potential difference.

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VanLukas

08/10/25 3:24pm

I often encounter this kind of problem when driving. The most common symptom of a faulty oxygen sensor is the sudden illumination of the engine warning light. Last time my car had this issue, the fuel consumption skyrocketed from 7 liters per 100 km to 10 liters, and the power dropped noticeably. The car seemed to struggle for breath when accelerating. I became suspicious and used an OBD scanner at the repair shop, which showed the trouble code P0420, confirming the sensor failure. Pay attention to the exhaust from the tailpipe—if you notice a strong gasoline smell or black smoke, these are also signs of a faulty sensor. Don't delay repairs, as neglecting it can damage the engine and increase repair costs. I recommend checking it during every 20,000 km maintenance service. The oxygen sensor is located in the front section of the exhaust pipe and tends to accumulate carbon deposits when aging, affecting its responsiveness. Replacing it early can save fuel and be more environmentally friendly.

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Should a car pass through accumulated water quickly or slowly?

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