P1428 – EVAP Vent Control System Low Flow (Nissan)

Description

The ECM detected insufficient flow in the EVAP vent control system.

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Symptoms

  • Rough idle
  • High emissions

Causes

  • Clogged vent line
  • Valve sticking
  • Vacuum issue

Diagnosis

  • Inspect vent lines
  • Test valve
  • Scan EVAP data

Repair

  • Clean lines
  • Replace valve