P1400Manufacturer-specific code

P1400 Code: EGR DPFE Sensor Circuit Low Signal (Ford)

On Ford, Lincoln and Mercury, the P1400 code means the EGR DPFE sensor circuit has a low signal. There are normally no symptoms, though sometimes you hear pinging under load. On other brands the number means something else.

Severity
Low
Can I keep driving?
Yes, no immediate risk
Estimated cost
$40 to $150
Difficulty
Easy
System
Emissions Control
Applies to
Depends on the manufacturer

Common in: Ford, Mitsubishi

Updated Reviewed by Renzo Chacca

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What the P1400 code means

P1400 is a manufacturer-specific code: the 1 in the second position means each automaker defines what it stands for, not the generic standard. That is why the same number means different things depending on the vehicle, as the table below shows. This page covers the Ford, Lincoln and Mercury meaning.

ManufacturerMeaning of P1400
Ford, Lincoln and MercuryEGR DPFE sensor circuit low signal
MitsubishiManifold differential pressure (MDP) sensor circuit

Ford measures EGR flow with the DPFE sensor, which compares the pressure before and after a calibrated orifice in the EGR tube using two hoses.

The computer sets the P1400 code when the DPFE signal is too low, usually because of a failed sensor or its wiring.

Before you repair anything, confirm the make, model, year and engine. With manufacturer codes, the same number can change even between engines from the same brand.

P1400 code symptoms

  • Check engine light on.
  • Normally no symptoms; sometimes pinging under load.

Likely causes of the P1400 code

  1. Failed DPFE sensor. Very common on Ford.
  2. Connector or wiring. Check the locking tab and the pins, and look for moisture or corrosion.
  3. 5 V reference. Confirm it with the tests in the diagnosis section.

How to diagnose the P1400 code step by step

  1. Measure the DPFE signal with the engine at idle. It is about 0.45 V on many sensors.
  2. Check the 5 V reference.
  3. Check the connector.

How to fix the P1400 code

  • Replace the DPFE sensor, preferably with a metal housing.
  • Repair the wiring, then clear the P1400 code and confirm it does not return.

Technical reference data

  • DPFE signal with no flow: about 0.45 V.
  • P1xxx codes are manufacturer-specific: confirm the definition with a scan tool that supports your brand.
  • Values are approximate: check the manufacturer data for your vehicle.

Brand-specific notes

Very common on Ford and Mazda vehicles with engines from the 1990s and early 2000s.

If your vehicle is another brand, check the table above for the meaning its manufacturer gives the code, and confirm it with a scan tool that supports that brand.

Frequently asked questions about P1400

What does the P1400 code mean on a Ford?
It means the EGR DPFE sensor circuit has a low signal. There are normally no symptoms, though sometimes you hear pinging under load.
Does P1400 mean the same thing on every brand?
No. On Mitsubishi it stands for the manifold differential pressure (MDP) sensor circuit.
Can I drive with a P1400 code?
Yes. The severity is low, though you should repair it so the EGR system can be monitored and you can pass an emissions test.
How much does it cost to fix P1400?
On a Ford the cost runs from about $40 to $150. The DPFE sensor is the main cost, and a wiring repair is cheaper.
Will a P1400 code clear itself?
Not if the sensor has failed. The light can go out for a while with a loose connection, but the code returns until the sensor or wiring is repaired.
What is the most common cause of P1400?
A failed DPFE sensor. Check the connector, the wiring and the 5 V reference before you buy one.

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Questions about the P1400 code

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