P1400 – DPFE Sensor Circuit Low Input (Ford)

Description

P1400 Ford indicates the DPFE sensor is reporting a voltage lower than expected during EGR flow monitoring.

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Symptoms

  • Rough idle
  • Hesitation
  • Poor acceleration

Causes

  • Failed DPFE sensor
  • Clogged EGR passages
  • Wiring damage

Diagnosis

  • Check DPFE voltage
  • Inspect EGR hoses
  • Test EGR flow

Repair

  • Replace DPFE sensor
  • Clean EGR passages
  • Repair wiring

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