P1405 1998 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 1998 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 1998 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 1998 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 1998 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 1998 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 1998 Ford F150 Code
What does the OBDII code P1405 mean on a 1998 Ford F150?
P1405 indicates a "DPF EGR Sensor Circuit High Voltage Detected," meaning the Exhaust Gas Recirculation (EGR) sensor is reporting excessively high voltage to the engine control module (ECM).
What are the common symptoms of the P1405 code?
Symptoms may include a check engine light, poor engine performance, rough idling, decreased fuel efficiency, and increased emissions.
What causes the P1405 code?
Common causes include a faulty EGR differential pressure sensor, damaged or clogged EGR passages, broken wiring or connectors, or a malfunctioning ECM.
Can a clogged EGR valve cause the P1405 code?
Yes, a clogged EGR valve or blocked passages can cause incorrect pressure readings, triggering the P1405 code.
How do I diagnose the P1405 code?
Start by inspecting the EGR sensor, wiring, and connectors for damage. Use a multimeter to check the sensor’s voltage output and confirm it matches manufacturer specifications.
What tools do I need to fix the P1405 code?
You’ll need tools like a multimeter, a scan tool to clear codes, and basic hand tools to inspect and replace the EGR sensor or clean the EGR valve.
Can I drive with the P1405 code?
Driving with this code is not recommended as it can lead to poor engine performance, higher emissions, and potential damage to the engine or catalytic converter.
How do I fix the P1405 code?
Repairs may include replacing the EGR differential pressure sensor, cleaning the EGR valve and passages, repairing damaged wiring, or replacing the ECM if necessary.
How much does it cost to repair the P1405 code?
Repair costs vary but typically range from $100 to $300, depending on whether you need to clean the EGR system or replace the sensor.
Will clearing the P1405 code solve the issue?
Clearing the code may temporarily turn off the check engine light, but the underlying issue must be fixed to prevent the code from returning.
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