Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means the car's computer is getting a signal that's too high from a part that checks how much exhaust gas is being reused in the engine. It's like getting a really loud noise when you're expecting a quiet sound.
The P1401 code is triggered when the Powertrain Control Module (PCM) detects a higher than expected voltage signal from the Differential Pressure Feedback EGR (DPFE) sensor.
The DPFE sensor measures the pressure difference across the EGR (Exhaust Gas Recirculation) system to monitor its performance. A high input signal indicates that the sensor is reporting a higher pressure difference than expected, which could be due to sensor malfunction, wiring issues, or a clogged EGR system.
• Check Engine Light is on
• Poor engine performance
• Rough idling
• Faulty DPFE sensor
• Wiring issues such as shorts or open circuits
• Clogged EGR passages
DPFE: Differential Pressure Feedback EGR
EGR: Exhaust Gas Recirculation
PCM: Powertrain Control Module
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for the DPFE sensor.
• Check the EGR passages for blockages.
• Replace the DPFE sensor if faulty.
• Repair or replace damaged wiring or connectors.
• Clean the EGR passages if clogged.
• OBD-II scanner
• Multimeter
• Basic hand tools
$100 - $300
Moderate
• Ford F-150
• Ford Explorer
• Mercury Sable
• Regularly clean the EGR system.
• Inspect and maintain sensor connections.
• Use high-quality fuel to reduce carbon buildup.
Sensor Issue
• Avoid driving with the Check Engine Light on for extended periods.
• Have the vehicle inspected by a professional if unsure about repairs.
Check with your vehicle's manufacturer for specific warranty coverage related to emissions components.
The P1401 code has been more common in older Ford models due to the design of the DPFE sensor.
Moderate – It should be addressed to avoid potential engine performance issues.
Driving with an active Check Engine Light may result in failing emissions tests and could lead to further engine damage.
• Engine at operating temperature
• Vehicle at idle
The DPFE sensor is typically located near the EGR valve on the engine.
Q: Can I drive with a P1401 code?
A: While the car may still run, it's not recommended to drive for long periods with this code active as it can affect engine performance.
Q: How can I prevent a P1401 code?
A: Regular maintenance of the EGR system and using quality fuel can help prevent this code.
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