AutoCodes – Ford – P1406 2002 Ford F150

P1406 2002 Ford F150 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 2002 Ford F150 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.

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Code Popularity 5,860

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 19, 2019

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P1406 2002 Ford F150 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 2002 Ford F150 - DPFE Sensor Circuit Downstream Hose - AutoCodes.com — P1406 2002 Ford F150 Code - DPFE Sensor Circuit Downstream Hose

What does this mean?

What are the Possible Causes of the DTC P1406 2002 Ford F150?

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 2002 Ford F150?

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 does this mean?

Code Tech Notes

While driving, the EGR monitor commands the EGR valve closed and checks the differential pressure across the EGR orifice. The test fails when the signal from the DPF EGR sensor continues to indicate EGR flow even after the EGR valve is commanded closed.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1406 2002 Ford F150 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 2002 Ford F150 code?

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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 2002 Ford F150 Code

1. What are the common symptoms of OBDII code P1406 on a 2002 Ford F150 related to the DPFE sensor circuit downstream hose?

- Common symptoms include rough idling, decreased fuel efficiency, and the illumination of the check engine light.

2. What does the DPFE sensor do in a 2002 Ford F150 and how is it related to the downstream hose circuit?

- The DPFE (Differential Pressure Feedback EGR) sensor measures the flow of EGR (Exhaust Gas Recirculation) gases. The downstream hose circuit is a part of the DPFE sensor system.

3. What are the possible causes of OBDII code P1406 on a 2002 Ford F150, specifically related to the DPFE sensor circuit downstream hose?

- Possible causes include a damaged or disconnected downstream hose, clogged EGR passages, or a faulty DPFE sensor.

4. How can I diagnose the issue causing OBDII code P1406 on my 2002 Ford F150 related to the DPFE sensor circuit downstream hose?

- You can visually inspect the downstream hose for damage or disconnect, check for clogs in the EGR passages, and test the DPFE sensor using a multimeter.

5. Are there any common repair tips for fixing OBDII code P1406 on a 2002 Ford F150 associated with the DPFE sensor circuit downstream hose?

- Repair tips include replacing a damaged downstream hose, cleaning out any clogs in the EGR passages, and replacing the DPFE sensor if it is faulty.

6. Can I drive my 2002 Ford F150 with OBDII code P1406 related to the DPFE sensor circuit downstream hose without causing further damage?

- It is not recommended to drive your vehicle for an extended period with this issue as it can affect engine performance and emissions.

7. How much does it typically cost to repair OBDII code P1406 on a 2002 Ford F150 tied to the DPFE sensor circuit downstream hose?

- The cost of repair can vary depending on the exact cause of the issue, but it may range from $100 to $300 for parts and labor.

8. Will resetting the OBDII code P1406 on my 2002 Ford F150 related to the DPFE sensor circuit downstream hose make the issue go away?

- Resetting the code may temporarily turn off the check engine light, but it will not fix the underlying problem causing the code to appear.

9. Can a DIY enthusiast with basic automotive knowledge fix OBDII code P1406 on a 2002 Ford F150 associated with the DPFE sensor circuit downstream hose?

- Yes, with the right tools and resources, a DIY enthusiast can repair this issue by following repair guides and tutorials specific to their vehicle.

10. How often does the DPFE sensor circuit downstream hose need to be inspected or replaced in a 2002 Ford F150 to prevent OBDII code P1406 from occurring?

- It is recommended to inspect the downstream hose and DPFE sensor system during routine maintenance checks or whenever symptoms of EGR system issues arise.