P1434 – EVAP System Vent Control Circuit Fault (Ford)

Description

P1434 Ford indicates a fault in the EVAP vent control circuit.

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Symptoms

  • Fuel smell
  • High emissions
  • Poor fuel economy

Causes

  • Wiring faults
  • Failed vent valve
  • Clogged vent filter

Diagnosis

  • Check wiring
  • Inspect vent valve
  • Test EVAP flow

Repair

  • Repair wiring
  • Replace vent valve
  • Clean vent filter