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P0442 fault code: what it means

P0442: Small leak in the EVAP system.

Engine and gearbox (powertrain) · Keep an eye on

Usual causes, most likely first

  1. loose or worn fuel cap
  2. cracked EVAP hose
  3. leaking purge valve
  4. leaking charcoal canister

P0442 by make

Hyundai

EVAP small leak detected.

Usual causes: worn fuel cap seal or rusty filler neck; faulty canister close valve / leak detection unit; cracked EVAP hose; leaking purge valve

Kia

EVAP small leak detected.

Usual causes: loose, worn or poorly sealing fuel cap; failing purge control solenoid valve; cracked EVAP hose; faulty canister close valve

Mitsubishi

Small leak in the fuel vapour (evap) system.

Usual causes: fuel cap seal worn or not tight; cracked evap hose; purge or vent valve leaking

Subaru

Small leak in the fuel vapour (evap) system.

Usual causes: fuel cap seal worn or not tight; rusted fuel filler neck (pinholes); cracked evap hoses at the charcoal canister; purge valve leaking

Not sure what P0442 means on your car? Ask Credov.

Before you clear it

Write the code down or photograph the scanner first. A code that comes straight back after clearing points to a fault that is still there. A car whose codes were cleared just before you arrived may be hiding one: the scanner's readiness monitors show "not ready" for a while after codes are cleared.

Researched by Credov from manufacturer and workshop sources. A fault code points to where a fault may be; a workshop confirms it with a diagnosis. Browse all fault codes.