Take the Engine-Codes.com Tech Challenge and test your car repair knowledge
In a Nissan Xterra which side is is bank one. I say it is the drivers side.
Bank 1 is the pasenger side.
O2 sensor and Bank identification here: http://nissanhelp.com/diy/xterra/projects/2005_2012_nissan_xterra_air_fuel_o2_sensor_location.php