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P0404 Ford Code - Exhaust Gas Recirculation Circuit Range/Performance

Quick Answer

The P0404 code for Ford vehicles indicates a problem with the Exhaust Gas Recirculation (EGR) system's circuit. Common causes include EGR Valve Stuck Open or Closed: A stuck EGR valve can prevent the correct flow of exhaust gases, triggering the P0404 code, Faulty EGR Position Sensor: The EGR position sensor monitors the EGR valve's position and can cause the P0404 code if it malfunctions, Clogged EGR Passages: Carbon buildup or debris can clog the EGR passages, preventing proper exhaust gas flow. 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
P0404 Ford indicates Exhaust Gas Recirculation Circuit Range/Performance.
Common causes
Common causes include EGR Valve Stuck Open or Closed: A stuck EGR valve can prevent the correct flow of exhaust gases, triggering the P0404 code, Faulty EGR Position Sensor: The EGR position sensor monitors the EGR valve's position and can cause the P0404 code if it malfunctions, Clogged EGR Passages: Carbon buildup or debris can clog the EGR passages, preventing proper exhaust gas flow.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 06, 2024
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Code P0404 Ford Description

The P0404 code for Ford vehicles indicates a problem with the Exhaust Gas Recirculation (EGR) system's circuit. The EGR system is responsible for recirculating a portion of the exhaust gases back into the engine's intake manifold to reduce nitrogen oxide emissions. When the EGR circuit is not functioning correctly, it can lead to issues with the vehicle's performance and emissions.

OBDII Code P0404 Ford - Exhaust Gas Recirculation Circuit Range/Performance
P0404 Ford Code - Exhaust Gas Recirculation Circuit Range/Performance

Common Causes of P0404 Ford

  1. EGR Valve Stuck Open or Closed: A stuck EGR valve can prevent the correct flow of exhaust gases, triggering the P0404 code.
  2. Faulty EGR Position Sensor: The EGR position sensor monitors the EGR valve's position and can cause the P0404 code if it malfunctions.
  3. Clogged EGR Passages: Carbon buildup or debris can clog the EGR passages, preventing proper exhaust gas flow.
  4. Wiring or Connector Issues: Faulty wiring or connectors in the EGR circuit can lead to the P0404 code.
  5. ECM Malfunction: In some cases, a malfunctioning ECM can incorrectly interpret data from the EGR system, triggering the P0404 code.

Symptoms of P0404 Ford

  1. Check Engine Light: The most common symptom associated with the P0404 code is the illumination of the check engine light on the vehicle's dashboard.
  2. Rough Idle: A malfunctioning EGR system can cause the engine to idle roughly or stall.
  3. Decreased Fuel Efficiency: The EGR system plays a role in optimizing fuel efficiency, so a faulty system can lead to decreased miles per gallon.
  4. Engine Misfires: A malfunctioning EGR system can cause the engine to misfire or hesitate during acceleration.
  5. Increased Emissions: A faulty EGR system can lead to increased emissions of nitrogen oxides, which can cause the vehicle to fail emissions tests.

How to Fix P0404 Ford

  1. Inspect EGR Valve: Check the EGR valve for proper operation and clean or replace if necessary.
  2. Check EGR Position Sensor: Test the EGR position sensor for correct readings and replace if faulty.
  3. Clean EGR Passages: Clean out any carbon buildup or debris from the EGR passages to ensure proper exhaust gas flow.
  4. Check Wiring and Connectors: Inspect the wiring and connectors in the EGR circuit for damage or corrosion and repair as needed.
  5. Reset ECM: After completing the repairs, reset the ECM to clear the P0404 code and monitor the system for proper operation.

Cost to Fix P0404 Ford

The cost of repairing a P0404 code can vary depending on the specific cause of the issue. On average, the cost of parts for an EGR valve replacement can range from $150 to $300, while labor costs can range from $100 to $200. Overall, the total repair cost for addressing a P0404 code may range from $250 to $500. It's important to note that these are rough estimates and actual costs can vary based on the vehicle's make and model, as well as the labor rates at the repair shop.

What does this mean?

Tech Notes for P0404 Ford

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

2003-2007 Ford F-Super Duty
2004-2007 Ford E-350, E-450
2003-2005 Ford Excursion
Ford Factory Service Bulletin OBDII Code P0404





User Submitted Video

When is the Code Detected?

An improper voltage signal is sent to ECM through the valve

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0404 Ford Code

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  • Old ford Endeavour have i...
    P0404 Dtc show...
    We check all wiring & replace solenoid valve, egr valve, Maf sensor too but concern not solve please advise

    Reply to Comment

  • Let me check if I can get more information. What year is your Endeavour?

    Reply to Comment