P1406 1999 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 1999 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 1999 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 1999 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 1999 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 1999 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 1999 Ford F150 Code
1. What does the OBDII code P1406 mean on a 1999 Ford F150?
P1406 refers to a malfunction in the DPFE (Differential Pressure Feedback EGR) sensor circuit, specifically related to the downstream hose.
2. What are the symptoms of code P1406 on a 1999 Ford F150?
Common symptoms include poor engine performance, reduced fuel efficiency, rough idling, hesitation during acceleration, and an illuminated check engine light.
3. What causes the P1406 code in a 1999 Ford F150?
The code is typically caused by a clogged or damaged DPFE sensor hose, a faulty DPFE sensor, carbon buildup in the EGR system, or wiring issues.
4. How can I diagnose the P1406 code on my 1999 Ford F150?
Inspect the DPFE sensor downstream hose for damage or clogs, check the DPFE sensor for proper operation, and test the wiring and connectors for continuity or corrosion.
5. Can I drive my 1999 Ford F150 with a P1406 code?
While the truck may still be drivable, prolonged operation with this code can lead to reduced performance and potential damage to the EGR system.
6. How do I fix the P1406 code on my 1999 Ford F150?
Replace the damaged DPFE sensor hose, clean or replace the DPFE sensor, remove carbon buildup from the EGR system, and repair any damaged wiring or connectors.
7. How much does it cost to repair the P1406 code on a 1999 Ford F150?
The cost can range from $50 to $200 depending on whether you only need to replace the DPFE sensor or also repair associated hoses and wiring.
8. What tools do I need to fix the P1406 code on a 1999 Ford F150?
You may need a multimeter for testing, basic hand tools to remove components, and possibly an OBDII scanner to clear the code after repairs.
9. How can I prevent the P1406 code from recurring?
Regularly inspect and clean the EGR system, replace worn or damaged hoses, and ensure the DPFE sensor is functioning properly.
10. Does the P1406 code affect emissions in my 1999 Ford F150?
Yes, this code can affect emissions by disrupting the proper operation of the EGR system, which is designed to reduce nitrogen oxide emissions.
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