P1406 1997 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 1997 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 1997 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 1997 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 1997 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 1997 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 1997 Ford F150 Code
1. What does the OBDII code P1406 mean on a 1997 Ford F150?
P1406 indicates a problem with the DPFE (Differential Pressure Feedback EGR) sensor circuit, specifically related to the downstream hose.
2. What are the common symptoms of code P1406 in a 1997 Ford F150?
Symptoms may include rough idling, decreased fuel efficiency, hesitation during acceleration, and the Check Engine Light turning on.
3. What causes the P1406 code to appear on a 1997 Ford F150?
Common causes include a clogged or damaged DPFE sensor, a cracked or disconnected EGR hose, carbon buildup in the EGR system, or wiring and connector issues.
4. How does the DPFE sensor affect the engine in a 1997 Ford F150?
The DPFE sensor monitors the pressure in the EGR system and helps regulate exhaust gas recirculation. A faulty sensor can disrupt engine performance and emissions control.
5. Can I drive my 1997 Ford F150 with the P1406 code?
While the vehicle may still be drivable, prolonged driving with this code can lead to reduced performance, increased emissions, and potential engine damage.
6. How can I fix the P1406 code on my 1997 Ford F150?
Inspect the DPFE sensor and hoses for damage or clogging. Replace the DPFE sensor if necessary, clean the EGR passages, and check electrical connections.
7. Where is the DPFE sensor located on a 1997 Ford F150?
The DPFE sensor is typically located near the EGR valve, mounted on or near the intake manifold, with hoses connected to the EGR system.
8. What tools are needed to repair the P1406 code on a 1997 Ford F150?
You may need a socket set, a screwdriver, a multimeter for electrical testing, and possibly a replacement DPFE sensor or EGR hose.
9. How much does it cost to repair the P1406 code on a 1997 Ford F150?
The cost depends on the repair, but replacing the DPFE sensor typically ranges between $50 and $150 for parts, plus labor if done by a mechanic.
10. Can a clogged EGR passage cause the P1406 code on a 1997 Ford F150?
Yes, carbon buildup in the EGR passages can restrict airflow and cause improper readings from the DPFE sensor, triggering the P1406 code.
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