DTC P0457: EVAP Control System Leak Detected (Fuel Filler Cap Loose/Off)

WARNING: This page is about a different car, the 2006 Mercury Mariner and 2006 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

P0457 - EVAP CONTROL SYSTEM LEAK DETECTED (FUEL FILLER CAP LOOSE/OFF)

Description:	A fuel tank pressure change greater than minus (-) 7 inches of water in 30 seconds occurred after refueling, or there is excessive purge (fuel vapor) flow greater than 0.06 pounds per minute.
Possible Causes:	Fuel filler cap not installed on refueling (storing continuous memory DTC) and the fuel cap indicator lamp (FCIL) may also be illuminated. The fuel filler cap is missing, loose or cross-threaded.
Diagnostic Aids:	Check for a missing fuel filler cap or the integrity of the cap. If OK, clear continuous memory DTCs and initiate the EVAP emission running loss monitor drive cycle.
Application	Key On Engine Off	Key On Engine Running	Continuous Memory
All	-	-	GO to Pinpoint Test HX .