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Home/DTC Codes/Lincoln/MKX/2007-2015 3.7L V6/P1406
P1406

DPFE Sensor Downstream Hose Off or Plugged

2007-2015 Lincoln MKX 3.7L V6 🇨🇦

Moderate SeverityPowertrain

Description

The DPFE sensor downstream hose is disconnected or plugged. This prevents the sensor from measuring exhaust pressure after the EGR orifice, making accurate EGR flow measurement impossible.

Symptoms

  • Check Engine Light
  • Poor EGR control
  • Rough idle
  • Failed emissions
  • Stalling

Common Causes

  • Disconnected downstream DPFE hose
  • Plugged downstream DPFE hose
  • Cracked hose
  • Carbon buildup in EGR passages
  • Faulty DPFE sensor

Diagnostic Steps

  1. Inspect downstream DPFE hose (hose closer to EGR valve)
  2. Check for blockage
  3. Replace deteriorated hose
  4. Clean EGR passages with EGR cleaner
  5. Test DPFE sensor

Repair Notes

Reconnect or replace DPFE downstream hose. Clean EGR system. Replace DPFE sensor if needed.

Related Codes

P0401EGR Flow Insufficient DetectedP1400DPFE Sensor Circuit Low InputP1400EGR System Monitor MalfunctionP1400DPFE Sensor Circuit Low InputP1400DPFE Sensor Circuit Low InputP1400Sub-Throttle Position SensorP1400EGR Output Stage MalfunctionP1400EGR System Monitor MalfunctionP1400EGR System Monitor MalfunctionP1400Fuel Tank Pressure Control Solenoid LowP1400DPFE Sensor Circuit Low InputP1400Sub-Throttle Position SensorP1400Sub-Throttle Position SensorP1400EGRC Solenoid ValveP1400EGRC Solenoid ValveP1401DPFE Sensor Circuit High InputP1401EGR Temperature SensorP1401Sub-Throttle Position Sensor Range/PerformanceP1401DPFE Sensor Circuit High InputP1401DPFE Sensor Circuit High InputP1401DPFE Sensor Circuit High InputP1401EGR Temperature SensorP1401Sub-Throttle Position Sensor Range/PerformanceP1401Sub-Throttle Position Sensor Range/PerformanceP1405DPFE Sensor Upstream Hose Off or PluggedP1405Turbo Pressure Sensor CircuitP1405DPFE Sensor Upstream Hose Off or PluggedP1405DPFE Sensor Upstream Hose Off or PluggedP1405Turbo Pressure Sensor CircuitP1405Turbo Pressure Sensor Circuit

Other Powertrain Codes

P1406 on Other Vehicles

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2003-2005 4.6L V8

Lincoln Aviator

2003-2005 4.6L V8 DOHC

Lincoln Aviator

2020-2024 3.0L Twin-Turbo V6

Lincoln Aviator

2020-2024 3.0L V6 Twin Turbo

Lincoln Aviator Grand Touring

2020-2024 3.0L Twin Turbo V6 PHEV

Lincoln Aviator Grand Touring

2020-2024 3.0L Twin-Turbo V6 Hybrid

Lincoln Aviator Grand Touring

2020-2024 3.0L V6 Twin Turbo Hybrid

Lincoln Blackwood

2002-2002 5.4L V8

Common Questions

What does code P1406 mean on a 2007-2015 Lincoln MKX?

P1406 stands for "DPFE Sensor Downstream Hose Off or Plugged". The DPFE sensor downstream hose is disconnected or plugged. This prevents the sensor from measuring exhaust pressure after the EGR orifice, making accurate EGR flow measurement impossible.

What are the symptoms of P1406 on a Lincoln MKX?

Common symptoms of P1406 include: Check Engine Light, Poor EGR control, Rough idle, Failed emissions, Stalling.

What causes P1406 on a 2007-2015 Lincoln MKX?

Common causes of P1406 include: Disconnected downstream DPFE hose, Plugged downstream DPFE hose, Cracked hose, Carbon buildup in EGR passages, Faulty DPFE sensor.

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