Begin by resetting the ECU to see if any codes can be cleared.
{P1259} Possible causes: VTEC solenoid valve, VTEC pressure switch, ECM, open or short in the VTEC solenoid valve, open or short in the VTEC pressure switch.
{P1337} Is just like the title states. No signal to the CKF sensor. This is either a voltage problem or a non functioning CKF sensor.
{P0453} Is a high voltage problem at the fuel tank pressure sensor? You could have possible leakage, breakage, or clogging of the FTPS vacuum lines. Another possible cause could be an open/shorted wire between that sensor and the ECU. Or the fuel tank pressure sensor is just shot.