ECU says mine is done, i reset it and it came right back up so I guess it needs to be replaced bad. So where is it and how do i do it. thanks

 

http://courtesyparts.com/A32_O2-sensors.html

 

get an O2 socket and go to town

 

1. Order the RH O2 sensor from Courtesy Nissan.

2. Jack up the Front end (passenger front area)

3. O2 socket from AutoZone. Remove old one/Replace with New.

4. Unplug the Old harness. Plug in the New harness.

*note you could also just take out the old one and clean it off with some Brake Cleaner and a Clean Terry cloth. Reset your Ecu to double check. This could save you some $.