P1471 – EVAP System Pressure Too Low (Nissan)

Description

The ECM detected excessively low pressure in the EVAP system.

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Symptoms

  • Fuel smell
  • High emissions

Causes

  • Vacuum leak
  • Valve stuck open
  • Hose damage

Diagnosis

  • Inspect hoses
  • Check valve
  • Smoke test

Repair

  • Repair hoses
  • Replace valve

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