P1401 2002 Ford F150 Code - DPFE Sensor Circuit High
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, Differential Pressure Feedback Electronic sensor harness is open or shorted, Differential Pressure Feedback Electronic sensor circuit poor electrical connection. 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
- P1401 2002 Ford F150 indicates DPFE Sensor Circuit High.
- Common causes
- Common causes include Faulty Differential Pressure Feedback Electronic (DPFE) sensor, Differential Pressure Feedback Electronic sensor harness is open or shorted, Differential Pressure Feedback Electronic sensor circuit poor electrical connection.
- 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 P1401 2002 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 P1401 2002 Ford F150?
- Faulty Differential Pressure Feedback Electronic (DPFE) sensor
- Differential Pressure Feedback Electronic sensor harness is open or shorted
- Differential Pressure Feedback Electronic sensor circuit poor electrical connection
- Damaged Powertrain Control Module (PCM)
How to Fix the DTC P1401 2002 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
There is a factory service bulletin for the 2002 Ford F-150:
2002 Ford F-150 Factory Service Bulletin OBDII Code P1401 Code
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1401 2002 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 P1401 2002 Ford F150 Code
1. What does the OBDII code P1401 mean on a 2002 Ford F150?
P1401 indicates that the DPFE (Differential Pressure Feedback EGR) sensor circuit is reading a voltage higher than expected.
2. What are the common symptoms of a P1401 code in a 2002 Ford F150?
Symptoms may include poor engine performance, decreased fuel efficiency, rough idling, and the Check Engine Light turning on.
3. What causes a P1401 code on a 2002 Ford F150?
Common causes include a faulty DPFE sensor, clogged EGR passages, damaged vacuum hoses, or electrical issues like corroded or loose wiring.
4. Can a bad DPFE sensor trigger the P1401 code?
Yes, a malfunctioning DPFE sensor is the most common cause of a P1401 code.
5. How do I fix a P1401 code on my 2002 Ford F150?
Inspect and replace the DPFE sensor if faulty, clean the EGR passages, check for damaged vacuum hoses, and repair any wiring issues.
6. How much does it cost to replace a DPFE sensor on a 2002 Ford F150?
The cost typically ranges between $50 and $150 for parts, with additional labor costs if done by a mechanic.
7. Can I drive my 2002 Ford F150 with a P1401 code?
While the truck may still operate, driving with a P1401 code can lead to reduced performance and potential damage to the engine or emissions system over time.
8. How do I test a DPFE sensor on a 2002 Ford F150?
Use a multimeter to check the voltage readings at the sensor. Compare the readings to manufacturer specifications to determine if the sensor is faulty.
9. Can a clogged EGR passage cause the P1401 code on a 2002 Ford F150?
Yes, blockages in the EGR system can lead to incorrect pressure readings, triggering the P1401 code.
10. Will clearing the code fix the P1401 issue on a 2002 Ford F150?
Clearing the code will only reset the Check Engine Light temporarily. The underlying issue must be resolved to prevent the code from returning.
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