P0442 on a 2013 Ford Explorer
P0442 means the EVAP system could not hold pressure or vacuum during a leak test, but the leak is small.
Not your vehicle? See general P0442 info.
Most common causes on the 2013 Ford Explorer
Ranked from 2,223 NHTSA owner complaints filed for this vehicle.
- 1
Cracked or gapped fuel tank / filler neck seal area
Medium severityOwners describe a gap at the fuel fill point with a persistent leak, a leak near the gas tank, and one case where a dealer pulled code P0456 (a near-identical small EVAP leak) and found a fractured fuel tank requiring replacement.
Reported in 3 NHTSA complaints - 2
Faulty fuel filler cap / filler door (fuel lid) seal
Low severityOne owner was told by the dealer their check-engine light was caused by 'the fuel lid,' consistent with a filler cap or filler-door seal not sealing the EVAP system properly.
Reported in 1 NHTSA complaintParts:fuel filler cap - 3
Cracked or leaking EVAP vapor line causing persistent post-refuel fuel odor
Low severityOne owner reports a fuel odor that returns specifically after each refueling despite exterior cleaning, consistent with a small EVAP vapor-line leak rather than a liquid fuel leak.
Reported in 1 NHTSA complaint - 4
Stuck or failing EVAP purge/vent valve
Low severityStandard cause of a small EVAP leak code; not directly evidenced in this batch's grounding complaints (which were dominated by unrelated fuel-delivery-module and exhaust-odor issues), but should be checked alongside the tank/cap findings above.
Common cause - 5
Cracked charcoal canister
Low severityA hairline crack in the canister housing produces a slow, steady vapor leak consistent with a small-leak code.
Common causeParts:EVAP charcoal canister - 6
Rusted or corroded fuel filler neck
Low severityCorrosion around the filler neck seal is a common small-leak source on higher-mileage vehicles from salt-belt regions.
Common causeParts:fuel filler neck
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These causes are aggregated from NHTSA owner complaints and general repair knowledge — this is not a diagnosis. P0442 on your car still needs shop confirmation before any repair.
Common symptoms
- Check engine light
- Fuel smell near vehicle
- Usually drives normally
- Hard start after fueling in some cases
What to check before replacing parts
Tighten and inspect the gas cap
Look for: A cap that doesn't click to full tightness, has a visibly cracked or flattened seal, or is simply missing is the single most common cause of a small EVAP leak — rule it out first.
Smoke-test the EVAP system
Look for: Because this is a small leak, expect only a thin wisp of smoke or a faint hiss at one spot (a hose, seam, or valve) rather than an obvious cloud — look closely and take your time.
Check purge valve sealing
Look for: A purge valve that doesn't hold vacuum when commanded closed lets a small amount of air bleed through, which the system reads as a leak during its self-test.
Inspect hoses near the tank and engine bay
Look for: Look for small cracks, soft/collapsed spots, or a hose that has pulled loose slightly at a fitting — any of these can leak just enough to trip a small-leak code without an obvious fuel smell.
Verify vent valve operation
Look for: A vent valve that doesn't seal fully when commanded closed prevents the system from holding vacuum during its self-test, which reads as a small leak even with no physical leak in the hoses.
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