P0455 is the EVAP system. You can either replace the solenoid which is above the throttle body (connected to it with a small hose) or clear it and see if it comes back. One of the very common quirks with these cars is that it will throw the P0455 code in cold weather for no reason.
P2261 is either a sticky bypass valve or the solenoid.
P2261 is either a sticky bypass valve or the solenoid.