Does a Faulty Oxygen Sensor Affect Engine Performance?
2 Answers
When the rear oxygen sensor in a car fails, the engine may exhibit symptoms such as unstable idling, misfiring, and surging. Therefore, it is essential to promptly address the issue or replace the sensor. A faulty oxygen sensor prevents the electronic fuel injection system's computer from receiving information about the oxygen concentration in the exhaust pipe, making it unable to perform feedback control on the air-fuel ratio. This can lead to increased fuel consumption and higher exhaust emissions. Additional information: To diagnose the issue, remove the oxygen sensor from the exhaust pipe and check if the vent holes on the sensor housing are clogged or if the ceramic core is damaged. If any damage is found, the oxygen sensor should be replaced. The condition of the oxygen sensor can also be assessed by observing the color of its tip, as follows: 1. Light gray tip: This indicates a normal condition. 2. White tip: Caused by silicon contamination, requiring immediate replacement of the sensor. 3. Brown tip: Caused by lead contamination; if severe, the sensor must also be replaced. 4. Black tip: Caused by carbon buildup, which can usually be cleared automatically after addressing the engine's carbon deposit issue.
A faulty oxygen sensor will definitely affect engine performance. I personally experienced this issue while driving - the car felt sluggish, acceleration was hesitant with no response when pressing the gas pedal, and fuel consumption noticeably increased. The reason is this sensor monitors oxygen levels in the exhaust system to help the ECU control the air-fuel mixture ratio. If it fails, the ECU loses data input and injects fuel improperly, resulting in incomplete combustion and naturally reduced power. Beyond power loss, you might notice engine hesitation or foul exhaust odors. I later had it towed to a repair shop where replacing the sensor cost under 1,000 RMB, but the savings in fuel and restored performance made it worthwhile. During routine maintenance, pay attention to dashboard warning lights and get timely inspections to avoid further issues.
