P1499 – EVAP System Vacuum Too High (Nissan)

Description

The ECM detected excessively high vacuum in the EVAP system.

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Symptoms

  • Hard start
  • Poor drivability

Causes

  • Blocked vent
  • Valve failure
  • Hose restriction

Diagnosis

  • Inspect vent lines
  • Test valve
  • Scan EVAP data

Repair

  • Repair hoses
  • Replace valve