Ford P1407 Trouble Code: Diagnosis, Symptoms, and Solutions for the EGR Sensor

The illuminated check engine light on your dashboard is always a cause for concern. When the diagnosis reveals the Ford P1407 trouble code, it specifically indicates a problem with the Exhaust Gas Recirculation (EGR) system. This code, specific to Ford group vehicles, indicates a malfunction in the EGR system’s Differential Pressure Feedback EGR (DPFE) sensor circuit. Understanding this fault, its causes, and the repair methods is essential for any owner or mechanic to restore the vehicle’s performance and environmental compliance.

What is the P1407 Code on a Ford?

The P1407 trouble code is a manufacturer-specific (OBD-II) code that translates to “EGR DPFE Sensor Circuit – Low Signal”. The EGR system’s role is to reduce nitrogen oxide (NOx) emissions by reintroducing a small amount of exhaust gas into the intake manifold. The DPFE sensor is the heart of this system on many Ford models. It measures the differential pressure of the gases passing through the orifice of a metal tube (the EGR tubes) connecting the EGR valve to the exhaust. The Powertrain Control Module (PCM) uses this reading to determine the actual EGR gas flow rate and verify that the system is operating according to the expected values.

Common Symptoms of the P1407 Fault

When the DPFE sensor sends an abnormally low signal or one outside the expected parameters, the PCM records the Ford P1407 code and illuminates the Malfunction Indicator Lamp (MIL). The symptoms accompanying this fault can vary in intensity:

• Illuminated Check Engine Light: The most obvious indication.
• Unstable or Rough Idle
• Loss of Power and poor performance during acceleration.
• Increased Fuel Consumption.
• Engine Hesitation or Stumbling, especially under load.
• In some cases, the vehicle may enter limp mode to protect the engine.

Possible Causes of the P1407 Code

Several components can be the source of this problem. An accurate diagnosis is necessary to avoid replacing parts unnecessarily.

• Faulty DPFE Sensor: This is the most common cause. The sensor itself, often made of plastic, can fail.
• Clogged or Leaking EGR Tubes: The small rubber hoses connecting the sensor to the exhaust system can become clogged with soot, dry out, crack, or develop leaks, leading to a loss of pressure and an incorrect reading.
• Wiring or Connector Issues: Broken, corroded wires, or a poorly connected electrical connector on the DPFE sensor can interrupt the signal.
• Faulty EGR Valve: Although the code directly points to the sensor, a clogged or stuck EGR valve can distort the measurements.
• PCM Problem: Extremely rare, but a failure of the PCM itself cannot be completely ruled out.

Diagnosis and Solutions for Repairing P1407

Before replacing the sensor, a thorough check is crucial.

1. Visual Inspection

Locate the DPFE sensor (usually mounted on top of the engine or near the EGR valve). Visually inspect the two small rubber hoses connected to it. Look for obvious signs of burning, cracks, leaks, or debris blocking them. Check the condition of the electrical connector and wiring.

2. Testing the EGR Tubes

Carefully disconnect the hoses from the sensor and blow through them to ensure they are not clogged. Replace them if they are damaged; this is an inexpensive repair and often sufficient.

3. Testing the DPFE Sensor

Using a multimeter, you can check the sensor’s reference voltage (usually 5V) and ground. The signal voltage should vary when the engine is idling and you gently accelerate. A lack of variation indicates a dead sensor.

4. Cleaning or Replacement

If the hoses are in good condition and the wiring is intact, the DPFE sensor is most likely the cause. Replacing it is the most common solution. Take this opportunity to check the condition of the EGR valve and clean it if necessary.

Conclusion

The Ford P1407 code is a well-known and often simple problem to solve. By starting with a meticulous inspection of the hoses and wiring, you can often identify the cause without investing in expensive parts. A faulty DPFE sensor disrupts the air-fuel mixture and engine performance. A properly executed repair will make the check engine light disappear, restore the vehicle’s power, and ensure controlled emissions.