P1405 1997 Ford F150 Code - DPF EGR Sensor Circuit High Voltage Detected
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 Faulty Differential Pressure Feedback Electronic (DPFE) sensor (EGR pressure sensor), Plugged or damaged EGR tube, Differential Pressure Feedback Electronic (DPFE) sensor harness is open or shorted. 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
- P1405 1997 Ford F150 indicates DPF EGR Sensor Circuit High Voltage Detected .
- Common causes
- Common causes include Faulty Differential Pressure Feedback Electronic (DPFE) sensor (EGR pressure sensor), Plugged or damaged EGR tube, Differential Pressure Feedback Electronic (DPFE) sensor harness is open or shorted.
- 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 P1405 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 is 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 P1405 1997 Ford F150?
- Faulty Differential Pressure Feedback Electronic (DPFE) sensor (EGR pressure sensor)
- Plugged or damaged EGR tube
- Differential Pressure Feedback Electronic (DPFE) sensor harness is open or shorted
- Differential Pressure Feedback Electronic (DPFE) sensor circuit poor electrical connection
- Faulty Powertrain Control Module (PCM)
How to Fix the DTC P1405 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 P1405 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 P1405 1997 Ford F150 Code
What does OBDII code P1405 mean on a 1997 Ford F150?
P1405 indicates "DPF EGR Sensor Circuit High Voltage Detected," meaning the EGR (Exhaust Gas Recirculation) sensor is reporting a voltage outside the expected range.
What are the common symptoms of code P1405 on a 1997 Ford F150?
Symptoms may include reduced engine performance, rough idling, poor fuel economy, increased emissions, or the Check Engine Light turning on.
What causes code P1405 on a 1997 Ford F150?
Common causes include a faulty DPFE (Differential Pressure Feedback EGR) sensor, damaged wiring or connectors, a clogged EGR system, or issues with the PCM (Powertrain Control Module).
How can I diagnose the P1405 code?
Inspect the DPFE sensor and its electrical connections for damage, test the wiring for continuity, and check the EGR valve for blockages or malfunctions.
Can a bad DPFE sensor trigger code P1405?
Yes, a faulty or failing DPFE sensor is a primary cause of the P1405 code, as it may send incorrect voltage signals to the PCM.
How do I fix the P1405 code on a 1997 Ford F150?
Possible fixes include replacing the DPFE sensor, cleaning or replacing the EGR valve, repairing damaged wiring, or clearing blockages in the EGR system.
Is it safe to drive with an active P1405 code?
Driving with this code can lead to reduced performance and higher emissions, but it’s generally not an immediate safety concern. However, prolonged driving without repairs may cause further damage.
How much does it cost to repair the P1405 code on a 1997 Ford F150?
Repair costs vary, but replacing a DPFE sensor typically costs between $50 and $200, including parts and labor. More extensive repairs to the EGR system may increase costs.
Can I clear the P1405 code without making repairs?
Clearing the code with an OBDII scanner may temporarily turn off the Check Engine Light, but the issue will likely return if the underlying problem isn’t resolved.
What tools do I need to troubleshoot the P1405 code?
Basic tools include an OBDII scanner, a multimeter for testing voltage, and possibly tools for removing and inspecting the DPFE sensor and EGR components.
Discuss the causes and fixes for P1405 1997 Ford F150 OBDII Code
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