P1456 – EVAP Very Large Leak Detected (Nissan)

Description

The ECM detected a very large leak in the EVAP system.

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Symptoms

  • Fuel odor
  • Check engine light

Causes

  • Broken hose
  • Open vent valve
  • Canister damage

Diagnosis

  • Smoke test
  • Inspect hoses
  • Scan EVAP data

Repair

  • Repair hoses
  • Replace valve

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