GA16DNE?

 

This engine is used in a car called Tsuru here in Mexico. Is like a Sentra of B13 series. This motor is different from GA16DE engine. Gives 105 HP (a bit less than GA16DE).

 

Just unscrew the rubber hose that is between the sensor and the throttle body. Remove the electrical connector from the sensor and then remove the 4 screws that hold the sensor to the air filter box. To clean it I'd just spray some carb cleaner on a rag and wipe the inside of the sensor out but be really careful not to touch the sensor itself. It's a little wire inside a pill sized opening on the right hand side of the sensor housing, in the airbox side of the sensor.