Engine-Codes - Lincoln - P1400 LINCOLN

P1400 LINCOLN - Differential Pressure Feedback Electronic Sensor Circuit Low Voltage

Repair Importance Level: 2/3
Repair Difficulty Level: 2/3  What is this?
Table of contents

P1400 LINCOLN Possible Causes

  • Differential Pressure Feedback Electronic Sensor harness is open or shorted
  • Differential Pressure Feedback Electronic Sensor circuit poor electrical connection
  • Faulty Differential Pressure Feedback Electronic Sensor

How is the P1400 LINCOLN code repair?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

Tech Notes

There is a factory service bulletin for the following Lincoln models:

2001 Lincoln Town Car
2002 Lincoln Town Car
2001-2002 Lincoln Town Car Factory Service Bulletin OBDII Code P1400 Code

What is the cost to diagnose the P1400 LINCOLN code

Labor: 1.0

The cost to diagnose the P1400 LINCOLN code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.
How much do you know about cars?

Take the AutoCodes.com automotive tests and turbo-charge your car repair knowledge

Play Now

When is the code detected?

Differential Pressure Feedback Electronic (DPFE) circuit low voltage detected

Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P1400 LINCOLN Meaning

The purpose of the Exhaust Gas Recirculation (EGR) system on your engine is to limit oxides of nitrogen (NOx) emissions. This is done by redirecting small amounts of exhaust gas back through the upper intake to get mixed in with the air/fuel charge. The resultant diluted air/fuel mixture (i.e., less oxygen per cubic foot) burns cooler and combustion chamber temperatures are reduced accordingly, thereby lowering NOx emissions.
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.

More Information

Need more information on how to fix the P1400 LINCOLN code?
Get Access to Factory Service Manuals

Need more help?

Get the P1400 Lincoln code diagnosed by a professional: Find a repair shop in your area