AutoCodes.com
Login with Google
AutoCodes – Ford – P1406 Ford

P1406 Ford Code - DPFE Sensor Circuit Downstream Hose

Quick Answer

The purpose of the Exhaust Gas Recirculation (EGR) system on your engine is to limit oxides of nitrogen (NOx) emissions. Common causes include Downstream hose is disconnected, Downstream hose is plugged (ice), Plugged or damaged Exhaust Gas Recirculation (EGR) tube. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means
P1406 Ford indicates DPFE Sensor Circuit Downstream Hose.
Common causes
Common causes include Downstream hose is disconnected, Downstream hose is plugged (ice), Plugged or damaged Exhaust Gas Recirculation (EGR) tube.
Severity
Moderate - service should be scheduled soon.
Can I drive?
The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
Save to My Repairs My Repairs
AI answers can be wrong. Verify repairs with testing. Open full chat
Code Popularity 98,598
How popular is this code, among other codes? Medium
What is this?
Table of contents Created and updated by William Orellana on Aug 19, 2019
💬 Need more help? Ask Coddy for instant answers — it's free!

Code P1406 Ford Description

The purpose of the Exhaust Gas Recirculation (EGR) system on your engine is to limit oxides of nitrogen (NOx) emissions. This is done by redirecting small amounts of exhaust gas back through the upper intake to get mixed in with the air/fuel charge. The resultant diluted air/fuel mixture (i.e., less oxygen per cubic foot) burns cooler and combustion chamber temperatures are reduced accordingly, thereby lowering NOx emissions.
The Ford DPFE/EGR system is controlled by the Powertrain Control Module (PCM). The system employs an EGR Valve, an Electronic Vacuum Regulator (EVR), and a Delta Pressure Feedback EGR sensor (DPFE).
The DPFE Sensor measures EGR flow across an orifice located inside the special EGR Tube. The orifice is positioned between two hose ports coming off the tube which are connected to the DPFE sensor with special heat-resistant hoses. When the EGR Valve is open, a pressure differential is created across the orifice (intake manifold pressure vs. exhaust pressure). By design, this difference in pressure is measured by the DPFE sensor in terms of voltage. The DPFE voltage signal output to the PCM is directly proportional to the flow of exhaust gas entering the intake manifold.
OBDII Code P1406 Ford - DPFE Sensor Circuit Downstream Hose - AutoCodes.com
P1406 Ford Code - DPFE Sensor Circuit Downstream Hose
What does this mean?

What are the Possible Causes of the DTC P1406 Ford?

  • Downstream hose is disconnected
  • Downstream hose is plugged (ice)
  • Plugged or damaged Exhaust Gas Recirculation (EGR) tube
  • Faulty Differential Pressure Feedback Electronic (DPFE) sensor
  • Differential Pressure Feedback Electronic (DPFE) sensor harness is open or shorted
  • Differential Pressure Feedback Electronic (DPFE) sensor circuit poor electrical connection

How to Fix the DTC P1406 Ford?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1406 Ford code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P1406 Ford code?

Need more information on how to fix the P1406 Ford code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1406 Ford code diagnosed by a professional: Find a repair shop in your area

Information for Specific Ford Models

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P1406 Ford Code

No Frequently Asked Questions about P1406 Ford Code found.

Discuss the causes and fixes for P1406 Ford OBDII Code

Submit a New Comment

  • 2002 ford escape 120 000 miles v6, already replaced egr solenoid, egr pipe, dpfe sensor, checked egr valve and is good, no vacuum leak found. what else could be ?

    Reply to Comment

  • Check the hose from the EGR tube to the DPFE sensor. See attached image.

    Reply to Comment

  • After 3 EGR/DPFE assemblies, 3 different mechanics and over $600.00 later on misdiagnosed problem, A trip to the Ford Dealer revealed that my P1406 code on my 2004 Lincoln Aviator was actually caused by a bad mass air flow sensor!

    Reply to Comment

  • Thank you for the information!!

    Reply to Comment
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play