The function of the oxygen sensor in automobiles
The main function of an automotive oxygen sensor is to monitor the oxygen content in exhaust gases and feed the information back to the engine control unit (ECU) to optimize the air-fuel ratio, improve fuel economy and reduce harmful emissions.
Youdaoplaceholder0 Core function
Youdaoplaceholder0 monitoring of exhaust gas oxygen concentration : The oxygen sensor detects the oxygen content in the exhaust gas through a ceramic sensitive element, converts the oxygen concentration into a voltage signal and transmits it to the ECU to achieve closed-loop control.
Youdaoplaceholder0 Optimize air-fuel ratio : By adjusting the fuel injection volume in real time, ensure that the engine operates near the theoretical air-fuel ratio (14.7:1), thereby enhancing power output and combustion efficiency.
The specific function of is
Youdaoplaceholder0 Pre-oxygen sensor : Located in front of the three-way catalytic converter, it directly monitors the oxygen concentration in the exhaust gas after combustion, providing real-time data on the concentration of the mixture to the ECU.
Youdaoplaceholder0 Post-oxygen sensor : Located after the three-way catalytic converter, it detects the oxygen concentration of the purified exhaust gas. By comparing the data with that of the pre-oxygen sensor, it can be determined whether the three-way catalytic converter has failed.
Youdaoplaceholder0 importance
Youdaoplaceholder0 Reduce fuel consumption : Precise air-fuel ratio control can reduce fuel waste, and fuel consumption may increase by 10% to 20% during malfunctions.
Youdaoplaceholder0 environmental protection and emission reduction : Reduce pollutants such as HC, CO, and NOx in exhaust gas through complete combustion to meet emission standards.
Youdaoplaceholder0 protection of three-way catalytic converter : Abnormal air-fuel ratio can cause the catalytic converter to overheat or get clogged. The oxygen sensor can indirectly protect its function.
A malfunction of the oxygen sensor in a car can lead to problems such as a decline in engine performance, increased fuel consumption and excessive exhaust emissions. Professional diagnosis is required before cleaning or replacement.
Youdaoplaceholder0 Typical fault manifestations
Youdaoplaceholder0 Power system abnormality : acceleration lag, idle vibration, insufficient climbing power, fuel consumption may increase by 15%-30%.
Youdaoplaceholder0 Emission warning triggered : The engine fault light remains constantly on. During exhaust gas testing, pollutants such as CO/HC exceed the standard by 3 to 4 times. The risk of failing the annual inspection is high.
Youdaoplaceholder0 Sensory warning signals : Black smoke from the exhaust pipe, blue smoke during cold start, and continuous abnormal noises in the engine compartment.
Youdaoplaceholder0 diagnosis and maintenance process
Youdaoplaceholder0 Fault confirmation .
Use the OBD diagnostic instrument to read the fault code (commonly P0130-P0134 series).
Observe whether the voltage signal of the oxygen sensor fluctuates normally within the range of 0.1-0.9V (normally 5-8 times per second).
Youdaoplaceholder0 repair plan: choose .
For mild carbon deposits, you can try soaking in a dedicated cleaning agent (for heating types, the cleaning probe needs to be disassembled).
Aging or damage requires replacement. It is recommended to choose parts from brands such as Bosch and NGK.
Youdaoplaceholder0 specification replacement steps .
Disconnect the negative terminal of the battery to prevent short circuits.
Use a special wrench to disassemble (spray a loosening agent if necessary).
The installation torque should be controlled within the range of 30 to 50N·m.
After replacement, the ECU needs to be reset and a test run should be conducted.
Youdaoplaceholder0 precautions
Youdaoplaceholder0 Operation safety : Work should only be carried out after the engine has completely cooled down to avoid burns and component damage.
Youdaoplaceholder0 Model matching : The interface specifications of different models may vary. It is necessary to verify the original factory number (for example, the sensors of Volkswagen EA888 and Toyota TNGA platform are not interchangeable).
Youdaoplaceholder0 Maintenance trap : 65% of the faults were misdiagnosed as problems with the three-way catalytic converter. It is recommended to conduct cross-validation through data flow.
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