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What happens when an oxygen sensor fails?

1 Answers

DeDerek

07/29/25 7:14am

When an oxygen sensor fails, the following symptoms may occur: the vehicle's engine malfunction indicator light turns on, unstable idling, insufficient engine power, sluggish acceleration, and black smoke from the exhaust. The causes of oxygen sensor failure include: 1. Ceramic element of the oxygen sensor cracking; 2. Heater resistance wire burning out; 3. Internal wiring of the oxygen sensor breaking or disconnecting; 4. Engine control unit malfunction. The oxygen sensor uses a ceramic sensing element to measure the oxygen potential in the vehicle's exhaust pipe, calculates the corresponding oxygen concentration based on chemical equilibrium principles, and achieves the purpose of monitoring and controlling the combustion air-fuel ratio to ensure product quality and compliance with exhaust emission standards. It is a critical measurement component.

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