How much does it cost to replace the oxygen senson on a 2001 Nissan Pathfinder?

hi, my friend the cost to replace the oxigen sensor depends if you go to the Nissan dealership is about $120.00 for one oxigen sensor or you can go to the discount auto parts, will cost $70.00 and it's easy to replace. you can do yourself and save a lot of money!! but make sure what sensor is not working because your Nissan pathfinder have 4 oxigen sensor. one before the catalistic and one after the catalistic. but Nissan pathfinder have two catalistics.