P0456 – EVAP System Very Small Leak Detected

Description

A very small leak has been detected in the EVAP system.

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Symptoms

  • Check engine light
  • Fuel smell
  • Slight rough idle
  • Failed emissions test
  • Reduced fuel efficiency

Causes

  • Loose gas cap
  • Cracked EVAP hose
  • Faulty purge valve
  • Faulty vent valve
  • Leaking charcoal canister

Diagnosis

  • Smoke test EVAP system
  • Inspect hoses
  • Test purge valve
  • Test vent valve
  • Check gas cap seal

Repair

  • Tighten or replace gas cap
  • Replace cracked hoses
  • Replace purge valve
  • Replace vent valve
  • Replace charcoal canister

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