P0457 - Evaporative Emission System Leak Detected (Fuel Cap Loose/Off)
WARNING: This page is about a different car, the 2010 Mercury Mariner and 2010 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
P0457 - EVAPORATIVE EMISSION SYSTEM LEAK DETECTED (FUEL CAP LOOSE/OFF)
| Description: | The powertrain control module (PCM) continuously monitors the fuel level and retains the last updated value prior to the ignition switch being placed in the OFF position. After the ignition switch is placed in the ON position a new fuel level is taken and compared to the level recorded at ignition OFF. If the fuel level has increased, a flag is set in the PCM indicating the vehicle was refueled. If the evaporative emission (EVAP) monitor detects a gross leak while the refueling flag is set, an incorrectly sealed fuel tank filler pipe is suspected and the DTC is set. When the DTC sets, a message on the instrument cluster displays to instruct the driver to check the capless fuel tank filler pipe. | ||
| Possible Causes: |
|
||
| Diagnostic Aids: | Verify the capless fuel tank filler pipe is sealed correctly. If OK, clear the continuous memory DTCs and test the system for correct operation. | ||
| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| All | - | - | GO to PINPOINT TEST HX . |