O2 Sensor Part Numbers

[Dee 2K]

I entered this question in general chat--so if it is repeat please disregard!I have a 2002 Pathfinder--the O2 Sensor Bank 2 Sensor 2 needs to be replaced--it has red sheathing on it & I was told to replace the one w/white sheathing also--Are these both rear? Does anyone know the factory numbers for them? The dealers I have called have offered no assistance except high price!