P0442 on a 2019 Ford Ecosport

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 2019 Ford Ecosport

Ranked from 451 NHTSA owner complaints filed for this vehicle.

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1
Purge valve failure
Medium severity
One owner had the purge valve replaced by a Ford service center after check-engine/stalling complaints; a purge valve that doesn't seal is a direct small-leak source.
Reported in 1 NHTSA complaint
Parts:purge valve
2
Fuel tank pressure (FTP) sensor failure
Medium severity
One owner reports a failed fuel pressure sensor requiring a costly repair; on this platform the fuel tank pressure sensor is what the PCM uses to detect small EVAP leaks, so a faulty sensor can itself trigger the code.
Reported in 1 NHTSA complaint
Parts:fuel tank pressure sensor
3
EVAP system component failure (documented EVAP repairs on this vehicle)
Medium severity
One owner reports the EVAP system was replaced as part of a string of repairs, confirming EVAP hardware issues occur on this vehicle.
Reported in 1 NHTSA complaint
4
Loose or worn gas cap
Low severity
The most common source of a small EVAP leak; a cap that seals poorly is the first thing to check.
Common cause
Parts:gas cap
5
Cracked or degraded EVAP hose/line
Medium severity
Rubber EVAP lines harden and crack with age/heat cycling, producing a small vapor leak.
Common cause
Parts:EVAP hose
6
Charcoal (EVAP) canister crack
Medium severity
A cracked canister housing is a common small vapor-leak source.
Common cause
Parts:EVAP canister
7
Vent valve stuck open
Medium severity
A vent valve that fails to seal allows vapor to escape and is a common small-leak trigger.
Common cause
Parts:vent valve

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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.

Rather have a pro handle it? Find a vetted local mechanic.

Matching symptoms

Check Engine Light