WARNING: This page is about a different car, the 2004 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.
Turn EVAP canister vent control valve counterclockwise.
Remove the EVAP canister vent control valve.
Do not reuse the O-ring, replace it with a new one.
Fig 1: Remove The EVAP Canister Vent Control Valve