Have Ford Questions? Ask a Mechanic for Answers ASAP
Welcome to JA!
Continuous Memory Diagnostic Trouble Code (DTC) P0446 indicates that Self-Test has detected the Evaporative Emission Control System has excessive fuel tank vacuum. Also, a DTC P0446 indicates a vent control malfunction.
Note: If the EVAP canister-CV solenoid and fuel tank assemblies are not accessible to perform the following step, GO to the Powertrain/Engine Group, Evaporative Emissions Section in the Workshop Manual for removal procedures.
Is a fault indicated?
Does the EVAP system pressure drop rapidly (quickly)?
Let me know if i can help more!