The oxygen sensor indirectly reflects the concentration of the mixture into the cylinder, and this information is transmitted to the electronic control unit (ECU) by fluctuating voltage, so the main method to judge the performance of the oxygen sensor is to detect the signal voltage value of the output of the oxygen sensor and its fluctuation range and fluctuation frequency. On the other hand, the engine can only activate the oxygen sensor if it reaches a certain temperature.
When installing automotive oxygen sensors, the following points need to be noted:
1. Distinguish the position: the oxygen sensor is installed in front of the three-way catalytic converter, and the post-oxygen sensor is installed behind the three-way catalytic converter.
2. Tool preparation: Use professional tools to install the oxygen sensor, especially considering that the thread size of the oxygen sensor is generally M18, and the recommended torque is 45-55Nm.
3. High temperature protection: The working temperature of the oxygen sensor can reach 800 ° C. Therefore, pay attention to preventing burns when removing or installing the oxygen sensor and ensure that the exhaust pipe is completely cooled before operating it.
