Evap Small Leak.
Check your gas cap, insure that the seal around it is in good shape. Then look in the engine compartment, near the ABS module area for a hose with a green screw on cap. You'll see that it goes to a solenoid. The other line from the solenoid will go to the engine. Pull both lines off the solenoid and look for small bits of charcoal inside. If you don't find any, good, because if do find some, that means that your charcoal canister has come apart and you'd need to replace it.
Look for any cracks in the vacuum lines to/from that same solenoid. There's only the two.
If all that is good, then you'll have to inspect the rest of the fuel vapor recovery system for cracked lines (rubber). You'l also have to look at the vent control valve on the charcoal canister for proper sealing. But typically, if that fails, it'll throw a P0455 (Gross Leak).
Do some easy checking, but look at your gas cap. If you think it needs replaced (vs just being loose after a fill up) then get a genuine Nissan cap. Most aftermarket ones will cause another code.