P0442 on a 2015 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 2015 Toyota Rav4

Ranked from 302 NHTSA owner complaints filed for this vehicle.

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1
Fuel tank vent flapper/valve not sealing
Medium severity
Toyota found and replaced a fuel tank with a flapper that "was not closing properly," causing pressurized fuel spray after fill-ups on this vehicle -- a flapper that won't seat can equally fail to hold the EVAP system's test vacuum.
Reported in 2 NHTSA complaints
Parts:fuel tank
2
EVAP purge solenoid / leak-detection pump failure
Medium severity
This owner had the EVAP leak-detection unit, fuel evaporative canister, leak-detection pump, and vapor canister purge solenoid all replaced while chasing recurring codes including P0442/P0455 -- pointing at the EVAP control hardware itself.
Reported in 1 NHTSA complaint
Parts:purge valve EVAP leak detection pump charcoal canister
3
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
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, disconnected, or rodent-damaged EVAP hose/line
Medium severity
Rubber EVAP lines dry out and crack with age/heat, or get chewed by rodents in a garage/driveway; any break is a direct leak path.
Common cause
Parts:EVAP hose
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
7
Faulty fuel tank pressure (FTP) sensor
Low severity
A drifting or failed FTP sensor reports a false leak to the PCM even when the EVAP system is physically sound.
Common cause
Parts:fuel tank pressure sensor

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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