2005+ CA Underhood stickers

You can order new ones from Nissan; they run about $5 each. If you want, go to NissanPartsDeal.com and search for parts using your VIN #. Then, under the part categories, go to "Miscellaneous." Then, click on "Caution Plate and Label" and you will see the available stickers, including the emission control label for your vehicle. You can order it through them or just get the part number and have your local dealer order it for you. Keep in mind that emission control labels weren't all the same for every 2005+ Frontier; there were usually at least four variants for every model year.