P0442 - Evaporative Emission System Leak Detected (Small Leak)

WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

P0442 - EVAPORATIVE EMISSION SYSTEM LEAK DETECTED (SMALL LEAK)

Description:	The powertrain control module (PCM) monitors the complete evaporative emission (EVAP) control system for the presence of a small fuel vapor leak. System failure occurs when a fuel vapor leak from an opening as small as 1.016 mm (0.040 in) is detected by the EVAP running loss monitor test.
Possible Causes:	After market EVAP hardware that does not conform to the required specifications Small holes or cuts in the fuel vapor hoses/tubes Canister vent solenoid stays partially open on closed command Damaged, missing or loosely installed fuel filler cap Loose fuel vapor hose/tube connections to the EVAP system components EVAP system component seals leaking at or near the EVAP canister purge valve, fuel tank pressure sensor, canister vent (CV) solenoid, fuel vapor control valve tube assembly or fuel vapor vent valve assembly
Diagnostic Aids:	Check for a missing fuel filler cap or the integrity of the cap. Check for loose or damaged vapor hoses. The evaporative emission system tester may be used to carry out the leak verification pressure test and leak detection smoke test.
Application		Key On Engine Off	Key On Engine Running	Continuous Memory
All		-	-	refer to PINPOINT TEST HX .