DTC P0456: Evaporative Emission System Leak Detected (Very Small Leak)

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P0456 - EVAPORATIVE EMISSION SYSTEM LEAK DETECTED (VERY SMALL LEAK)

Description: This DTC sets when a fuel vapor leak from an opening as small as 0.508 mm (0.020 inch) is detected by the EVAP running loss monitor test.
Possible Causes: Very small holes or cuts in the fuel vapor hoses/tubes Loose fuel vapor hose or tube connections to the EVAP system components EVAP system component seals leaking
Diagnostic Aids: Check for a missing fuel filler cap or the integrity of the cap. Verify the capless fuel tank filler pipe is sealed correctly (if equipped). Install and remove the supplemental fueling adapter five times in the capless fuel tank filler pipe to clear debris on the seal. Refer to the Owner Literature for the location of the supplemental fueling adapter in the vehicle. Check for loose or damaged vapor hoses. Visually inspect the EVAP canister inlet port, EVAP canister vent valve filter, and EVAP canister vent hose assembly for contamination or debris. For Fiesta, there is a Job Aid available for EVAP System diagnosis. For additional information, copy and paste the following URL into your web browser: www.fordtechservice.dealerconnection.com/vdirs/servicetips/pdf/2011_12_fiesta_DTC.pdf.
Application	Key On Engine Off	Key On Engine Running	Continuous Memory
Fiesta	GO to PINPOINT TEST HZ .
All others	GO to PINPOINT TEST HX .