What to Do When the Oxygen Sensor Fails?

1 Answers
KimberlyDella
07/30/25 7:15am
Solution for oxygen sensor failure: Simply replace it with a new one. The oxygen sensor is a crucial component in a car, installed near the catalytic converter. All vehicles are equipped with a catalytic converter, which is used to purify exhaust gases. There are oxygen sensors both before and after the catalytic converter. The oxygen sensor in front of the catalytic converter measures the oxygen content in the exhaust. This sensor sends data to the ECU, which can then adjust the air-fuel ratio based on this information. The oxygen sensor behind the catalytic converter checks whether the catalytic converter is functioning properly. If the data sent to the ECU by both the front and rear oxygen sensors are identical, it indicates that the catalytic converter has failed. In such cases, a warning light will illuminate on the car's dashboard to alert the driver.
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