P0442 on a 2019 Toyota Rav4

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 Toyota Rav4

Ranked from 869 NHTSA owner complaints filed for this vehicle.

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1
EVAP vent valve / fuel tank pressure control fault limiting fill and holding leak-test pressure
Medium severity
Five separate owners describe the pump shutting off or fuel gushing back at roughly half tank capacity on this exact model/year -- a widely reported RAV4 Hybrid fuel-fill defect tied to the tank pressure/vent control system that also governs the EVAP leak-monitor test.
Reported in 5 NHTSA complaints
Parts:fuel tank pressure sensor EVAP vent valve
2
Cracked or leaking EVAP line producing a persistent fuel odor
Medium severity
One owner reports a worsening gasoline smell on startup over roughly two years, consistent with a slow vapor leak somewhere in the EVAP line/canister path.
Reported in 1 NHTSA complaint
Parts:EVAP hose
3
EVAP purge valve stuck open or failed
Medium severity
A purge valve that leaks or won't close lets fresh air into the evap system during the leak test, mimicking a leak.
Common cause
Parts:purge valve
4
Loose, cracked, or missing gas cap
Low severity
The single most common source of a small EVAP leak; a cap that doesn't seal (or was left off after fueling) lets the system fail its leak-monitor test.
Common cause
Parts:fuel cap
5
Cracked charcoal (EVAP) canister
Medium severity
A cracked canister housing leaks vapor directly and is a common age-related failure; look for fuel smell near the rear underbody.
Common cause
Parts:charcoal canister
6
Rusted or corroded fuel filler neck
Medium severity
Road salt corrodes the filler neck/pipe over years, opening a leak path that a new gas cap won't fix.
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