Question

I got a p0446 code on my 1997 Ford Crown Victoria 4.6L, what is the meaning?

Answer 1

Continuous Memory Diagnostic Trouble Code (DTC) P0446 or P1450 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. Possible causes:

• EVAP canister purge outlet tube (EVAP canister purge valve to EVAP canister) blockages or kinks.
• EVAP canister tube (fuel tank to EVAP canister) blockages or kinks.
• Fuel vapor elbow on EVAP canister contaminated.
• Restricted EVAP canister.
• Canister vent (CV) solenoid stuck closed (partially or fully).
• Plugged or contaminated CV solenoid filter.
• EVAP canister purge valve stuck open.
• Fuel filler cap stuck closed (no vacuum relief).
• VREF circuit open in fuel tank pressure (FTP) sensor.
• Damaged FTP sensor.