I just changed it one month ago and im getting the code agian , no other code jsust this one, i might have messed up the sensor when hooking up the a/f gauge but thats besides the point. I bought it form the dealer but installed it myself, does nissan give a warrenty?

 

They normally have a 12 month warranty on a lot of their parts. Just ask the dealer parts counter.

 

http://www.courtesyparts.com/policy_warranty.html