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Car Oxygen Sensor: Function, Failure Symptoms and Replacement
The oxygen sensor monitors the amount of oxygen in exhaust gases.
Its signal helps the engine control system adjust the air-fuel mixture for efficient combustion.
A faulty sensor can affect engine performance, fuel consumption and emissions.
How Does an Oxygen Sensor Work?
The sensor measures oxygen levels in the exhaust stream.
The engine control unit uses this information to adjust fuel delivery.
Depending on the vehicle design, there may be sensors located before and after the catalytic converter.
Their functions can differ.
Common Oxygen Sensor Failure Symptoms
Check Engine Light
A malfunctioning sensor may trigger a warning light.
A diagnostic scan can help identify the related fault code.
Increased Fuel Consumption
Incorrect oxygen readings can affect fuel mixture control.
This may result in higher fuel consumption.
Rough Engine Operation
A faulty sensor can contribute to unstable engine operation, especially under certain driving conditions.
Poor Acceleration
Incorrect fuel mixture control may affect throttle response and engine performance.
Failed Emissions Test
A malfunctioning oxygen sensor can contribute to abnormal exhaust emissions.
Why Do Oxygen Sensors Fail?
Several factors can affect sensor life:
- High exhaust temperatures
- Contamination
- Oil consumption
- Coolant entering the combustion chamber
- Wiring damage
- Normal aging
The sensor should not automatically be blamed for every engine problem.
Oxygen Sensor Replacement Tips
Before replacing the sensor, check the diagnostic code and related wiring.
The correct replacement should match:
- Sensor position
- Connector
- Wire configuration
- OE number
- Engine application
Thông Tin Liên Hệ Đặt Hàng Toàn Quốc:
Công ty TNHH xuất nhập khẩu Thương mại và Dịch vụ Thành Dũng Giấy ĐKKD số 0109152593 do sở Kế hoạch và Đầu tư Hà Nội cấp ngày 03/04/2020
Bản quyền trang web thuộc về Công Ty TNHH Thành Dũng
Responsible for Publication by Mr Lai Tran Thanh Vice President of Thành Dũng company
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