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In the 2005 Ford Expedition, when the code P1450 appears, it means the system is having trouble releasing vacuum from the fuel tank while the engine is running, but not idling. This issue can have various causes, such as a stuck fuel filler cap, an open CV solenoid, a clogged CV solenoid filter, a stuck open EVAP purge valve, a faulty FTP sensor, or obstructions in the EVAP canister tubes. Though not critical, it's important to address this problem before your next emissions test, especially if required by your state.
The 2005 Ford Expedition's P1450 code indicates that the powertrain control module (PCM) is conducting system checks and has found high vacuum levels in the fuel tank or evaporative emission system.