P1406 2003 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 2003 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.
Code P1406 2003 Ford F150 Description
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.
What are the Possible Causes of the DTC P1406 2003 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 2003 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.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1406 2003 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.
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Frequently Asked Questions about P1406 2003 Ford F150 Code
What does the OBDII code P1406 mean on a 2003 Ford F150?
Code P1406 indicates an issue with the DPFE (Delta Pressure Feedback EGR) sensor circuit, specifically related to the downstream hose. This sensor monitors the flow of exhaust gases in the EGR system.
What are the common symptoms of code P1406 on a 2003 Ford F150?
Symptoms include rough idling, reduced fuel efficiency, engine hesitation, stalling, or the Check Engine Light being illuminated.
What causes the P1406 code on a 2003 Ford F150?
Common causes include a damaged or disconnected DPFE sensor hose, a faulty DPFE sensor, carbon buildup in the EGR system, or an electrical issue in the sensor circuit.
How do I fix the P1406 code on my 2003 Ford F150?
Inspect and replace any damaged or disconnected DPFE sensor hoses, clean the EGR passages, test the DPFE sensor, and check wiring or connectors for damage. Replace the sensor if necessary.
Can I drive my 2003 Ford F150 with the P1406 code?
While the vehicle may still be drivable, prolonged operation with this issue can lead to reduced performance, increased emissions, and potential engine damage. It’s best to address the problem promptly.
How do I locate the DPFE sensor on a 2003 Ford F150?
The DPFE sensor is typically located near the EGR valve and connected to it via rubber hoses. Refer to your vehicle’s service manual for the exact location.
What tools are needed to fix the P1406 code on a 2003 Ford F150?
Basic tools like pliers, wrenches, a multimeter, and a vacuum gauge might be needed. Additionally, an OBDII scanner can help confirm the issue after repairs.
Does the DPFE sensor frequently fail on the 2003 Ford F150?
Yes, the DPFE sensor is a known weak point on certain Ford models, including the 2003 F150, and may require replacement over time.
How much does it cost to replace the DPFE sensor on a 2003 Ford F150?
The cost of a DPFE sensor replacement typically ranges from $50 to $150 for parts, with additional labor costs if done by a mechanic.
How do I prevent the P1406 code from recurring on my 2003 Ford F150?
Regularly inspect and clean the EGR system, replace worn hoses, and use quality fuel to minimize carbon buildup and maintain proper sensor function.
Discuss the causes and fixes for P1406 2003 Ford F150 OBDII Code
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