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2003-2004 Crown Victoria/Grand Marquis and Town Car vehicles may exhibit a malfunction indicator light (MIL) with DTC P0442 (Evaporative Emission System Leak Detected (small leak)) in memory.
This may be an erroneous DTC set due to a partial blockage (rather than a leak) of the fresh air vent hose connected to the canister vent valve.
A spider nest may cause this blockage.
ACTION:
Perform a smoke machine phase 1 – leak verification pressure test per the PC/ED. If a leak is indicated, proceed with normal leak detection diagnostics.
If there is no leak indicated, remove and visually inspect the fresh air vent hose for a spider nest or other such blockage.
Clear the hose by blowing out with compressed air and clear the DTC.
