P0442 on a 2019 Subaru Crosstrek

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 Subaru Crosstrek

Ranked from 281 NHTSA owner complaints filed for this vehicle.

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1
EVAP system restriction from fuel-system resin residue (TSB 09-82-23)
Medium severity
One owner's vehicle had recurring EVAP faults and refueling trouble traced to resin residue clogging downstream EVAP components; Subaru's TSB explicitly covers this resin-contamination pattern on this fuel system.
Reported in 1 NHTSA complaint
Parts:charcoal canister
2
Charcoal canister blockage or crack
Low severity
The dealer in that same case replaced the charcoal canister and EVAP filter for the recurring check-engine light and fuel-acceptance problem.
Reported in 1 NHTSA complaint
Parts:charcoal canister
3
Rodent-damaged fuel/EVAP line
Medium severity
A separate owner had a high-pressure fuel line chewed by a rodent, a known small-leak entry point into the EVAP/fuel system on this platform.
Reported in 1 NHTSA complaint
Parts:fuel line
4
Loose or worn gas cap
Low severity
A cap that no longer seals fully is the single most common cause of a small EVAP leak code.
Common cause
Parts:gas cap
5
Cracked or brittle EVAP hose
Low severity
Age and heat cycling harden and crack EVAP lines, producing a small, steady leak.
Common cause
6
Purge valve leaking or stuck open
Low severity
A leaking purge solenoid lets outside air into the EVAP system during the monitor's vacuum test.
Common cause
Parts:purge valve
7
Rusted or damaged fuel filler neck
Low severity
Corrosion or damage at the filler neck creates a small unmetered leak path.
Common cause
Parts: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.

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

Matching symptoms

Check Engine Light