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Home/DTC Codes/Lincoln/MKX/2016-2018 3.7L V6/P1405
P1405

DPFE Sensor Upstream Hose Off or Plugged

2016-2018 Lincoln MKX 3.7L V6 🇩🇪

Moderate SeverityPowertrain

Description

The DPFE sensor upstream hose is disconnected or plugged. This prevents the sensor from accurately measuring exhaust backpressure before the EGR orifice.

Symptoms

  • Check Engine Light
  • Poor EGR flow control
  • Rough idle
  • Failed emissions
  • Reduced power

Common Causes

  • Disconnected upstream DPFE hose
  • Plugged upstream DPFE hose (carbon buildup)
  • Cracked hose
  • Faulty DPFE sensor

Diagnostic Steps

  1. Visually inspect upstream DPFE hose (hose closer to exhaust manifold)
  2. Check for carbon blockage in hose
  3. Blow through hose to verify flow
  4. Replace hose if cracked or deteriorated
  5. Test DPFE sensor if hoses are OK

Repair Notes

Reconnect or replace DPFE upstream hose. Clean carbon from hose. Replace DPFE sensor if hoses are good.

Related Codes

P0401EGR Flow Insufficient DetectedP1400Sub-Throttle Position SensorP1400DPFE Sensor Circuit Low InputP1400EGR System Monitor MalfunctionP1400EGR Output Stage MalfunctionP1400DPFE Sensor Circuit Low InputP1400EGRC Solenoid ValveP1400DPFE Sensor Circuit Low InputP1400EGRC Solenoid ValveP1400Sub-Throttle Position SensorP1400Sub-Throttle Position SensorP1400DPFE Sensor Circuit Low InputP1400Fuel Tank Pressure Control Solenoid LowP1400EGR System Monitor MalfunctionP1400EGR System Monitor MalfunctionP1401EGR Temperature SensorP1401DPFE Sensor Circuit High InputP1401DPFE Sensor Circuit High InputP1401DPFE Sensor Circuit High InputP1401Sub-Throttle Position Sensor Range/PerformanceP1401DPFE Sensor Circuit High InputP1401Sub-Throttle Position Sensor Range/PerformanceP1401Sub-Throttle Position Sensor Range/PerformanceP1401EGR Temperature SensorP1406EGR Valve Pintle Position CircuitP1406EGR Valve Pintle Position CircuitP1406DPFE Sensor Downstream Hose Off or PluggedP1406EGR Valve Pintle Position CircuitP1406DPFE Sensor Downstream Hose Off or PluggedP1406EGR Valve Pintle Position CircuitP1406DPFE Sensor Downstream Hose Off or PluggedP1406EGR Valve Pintle Position CircuitP1406EGR Valve Pintle Position CircuitP1406EGR Valve Pintle Position CircuitP1406EGR Valve Pintle Position Circuit

Other Powertrain Codes

P1405 on Other Vehicles

Lincoln Aviator

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 P1405 mean on a 2016-2018 Lincoln MKX?

P1405 stands for "DPFE Sensor Upstream Hose Off or Plugged". The DPFE sensor upstream hose is disconnected or plugged. This prevents the sensor from accurately measuring exhaust backpressure before the EGR orifice.

What are the symptoms of P1405 on a Lincoln MKX?

Common symptoms of P1405 include: Check Engine Light, Poor EGR flow control, Rough idle, Failed emissions, Reduced power.

What causes P1405 on a 2016-2018 Lincoln MKX?

Common causes of P1405 include: Disconnected upstream DPFE hose, Plugged upstream DPFE hose (carbon buildup), Cracked hose, Faulty DPFE sensor.

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