How to Determine Oxygen Sensor Failure?
1 Answers
Use a fault diagnostic tool to inspect the engine, extract fault codes, and observe the data stream. The working condition of the air-fuel ratio and the oxygen sensor can be determined by the amplitude and frequency of the oxygen sensor's voltage changes. If functioning normally, the voltage should fluctuate between 0.4V and 0.6V. If the fluctuation range is between 0.1V and 0.9V, it indicates variations between rich and lean mixtures, which may be due to fuel injector leakage or blockage. If the voltage remains unchanged at 0.45V, the oxygen sensor can be determined to be faulty. Additional Information: 1. Fault Characteristics: Unstable idle speed and excessive fuel consumption. A damaged oxygen sensor leads to insufficient engine power, sluggish acceleration, and black smoke from the exhaust. 2. Handling Method: Replace the oxygen sensor, re-inspect with a fault diagnostic tool, test drive to confirm normal operation, and the fault is resolved.