DTC P0451: EVAP System Pressure Sensor Range/Performance Problem

Turn ignition off. Connect scan tool. Turn ignition on. Retrieve DTCs. If any other DTCs are set, diagnose those DTCs first. If DTC P0451 is only DTC set, turn ignition off. Check fuel filler cap for tightness. Check for disconnected, leaking or plugged vacuum hoses and pipes between fuel tank and fuel tank pressure sensor. Check for disconnected, leaking or plugged air ventilation hoses and pipes between fuel tank and fuel filler pipe. Repair or replace as necessary. If all components are okay, replace fuel tank pressure sensor.