P0455 Evaporative Emission Control System Leak Detected (gross leak)... The leak could be anywhere in the evap system which runs the entire length of the vehicle. Most often it is either the gas cap or the fuel filler neck grommet.
The circled piece in the pic is the PCV (Positive Crankcase ventilation) valve. Yes they do pull out very easily.
I went to school to be a mechanic, so I know what I'm talking about most of the time.
mods in the garage, slowly getting peppier.