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Could be as simple as a loose or bad fuel cap.
EVAP system, very small leak detected.
Evap System. Large leak.
You have a small "EVAP" leak. Start with replacing the fuel cap.
Trouble code P0456 means: EVAP Control System Very Small Leak (0.020") Detected
The EVAP purge solenoid on a 2001 Nissan Sentra GXE is under the hood. It is mounted to the top of the intake manifold.
Evap Canisters on all gm vehicles are not servicable from 1990-2009 year
In the 2001 Toyota Corolla the evap purge solenoid valve is located near the underside of the air cleaner. This is an emissions control device.
evap vacuum cut valve bypass valve
the 4308 code is for a evap system leak. this could be caused by many different components including the filler neck, evap lines, evap purge valve, vent control valve or even a loose or bad gas cap.
Evap Leak
Trouble code P0455 means: EVAP System Large Leak Detected