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2010 LINCOLN MKZ
3.5L V6•FWD•AUTOMATIC•gas
9 active safety recalls on this vehicle — view recalls
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Repairs0Labor548Torque3555Fluid6DTC939Battery1Maintenance0Recalls9
P1406moderate severityPowertrain

DPFE Sensor Downstream Hose Off or Plugged

on 2010 Lincoln MKZ 3.5L V6 · FWD

What this code means

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.

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🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Lexus & Toyota Mechanic · 20+ years. Spot an error? Use the Help link above — a human reads every report.
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