First get a 2 philips screwdriver remove 4 screws across the top of the open glove box catch the center metal latch it goes only one way and two each corner at the bottom dash screws pull the glove box out. Now there is a retangular cover that unsnaps under that is a nasty allergen covered incabin micro filter. Nissan is the only place that seels the correct filter..How do you change the cabin filter on a 2005 Nissan Sentra?
It is! Just open your glove box and you may see a little compartment towrds the top of it. You just pull it out and replace the cabin filter. I used to work at Jiffy Lube and we used to replace these all the time. If you cant figure it out i would recommend going to a Jiffy Lube, and since you already have a filter, they may not charge you for labor, since its fairly simple.
