Nissan 22693-1AA0A Air Fuel Ratio Sensor

You need to keep the sensor and its connector clean and avoid using solvents. The silicone boot should be correctly installed. For upstream sensors, find the connector at the valve cover's rear, disconnect it, and unscrew the sensor with an oxygen sensor socket. Use anti-seize compound on the threads if reusing. For downstream sensors, raise the vehicle, locate the sensor, disconnect the connector, and loosen the sensor. Apply anti-seize if reusing. Installation is the reverse of removal, ensuring proper tightening.

The electrical connector should be located and disconnected, then the sensor can be unscrewed using an oxygen sensor socket.

For downstream oxygen sensors, the vehicle should be raised, the sensor should be located, the electrical connector should be disconnected, and the sensor should be unscrewed.

To service downstream oxygen sensors, you should first securely raise the vehicle on jackstands. Then, disconnect the wiring harness from the sensor's pigtail. Next, unscrew the sensor using an oxygen sensor socket. If you are reusing the old sensor, apply anti-seize compound to the threads before securing the sensor tightly during installation.