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Engine-Codes – Generic – P1404

P1404 Code - EGR Position Sensor Rationality Closed

Quick Answer

The P1404 code indicates that there is a problem with the Exhaust Gas Recirculation (EGR) position sensor in the vehicle. Common causes include Faulty EGR Position Sensor: The sensor itself may be faulty or damaged, causing it to send incorrect signals to the vehicle's engine control module, Carbon Buildup: Carbon deposits can accumulate in the EGR valve or passages, preventing it from closing properly, Wiring Issues: Wiring harnesses connected to the EGR position sensor may be damaged, corroded, or disconnected. 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
P1404 indicates EGR Position Sensor Rationality Closed.
Common causes
Common causes include Faulty EGR Position Sensor: The sensor itself may be faulty or damaged, causing it to send incorrect signals to the vehicle's engine control module, Carbon Buildup: Carbon deposits can accumulate in the EGR valve or passages, preventing it from closing properly, Wiring Issues: Wiring harnesses connected to the EGR position sensor may be damaged, corroded, or disconnected.
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 Aug 19, 2024
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Code P1404 Description

The P1404 code indicates that there is a problem with the Exhaust Gas Recirculation (EGR) position sensor in the vehicle. The EGR system is responsible for recirculating a portion of the engine's exhaust gas back into the intake manifold to reduce emissions. The EGR position sensor is a crucial component that monitors the position of the EGR valve to ensure it is functioning correctly. When the sensor detects a rationality issue in the closed position, it means that the EGR valve may not be closing properly, leading to potential performance issues and increased emissions.

OBDII Code P1404 - EGR Position Sensor Rationality Closed
P1404 Code - EGR Position Sensor Rationality Closed

Common Causes of P1404

  1. Faulty EGR Position Sensor: The sensor itself may be faulty or damaged, causing it to send incorrect signals to the vehicle's engine control module.
  2. Carbon Buildup: Carbon deposits can accumulate in the EGR valve or passages, preventing it from closing properly.
  3. Wiring Issues: Wiring harnesses connected to the EGR position sensor may be damaged, corroded, or disconnected.
  4. Vacuum Leak: A vacuum leak in the EGR system can affect the sensor's ability to monitor the position of the EGR valve.
  5. EGR Valve Stuck Open: If the EGR valve is stuck open, it can trigger the P1404 code as the sensor detects a rationality issue with the closed position.

Symptoms of P1404

  1. Check Engine Light: The most common symptom associated with the P1404 code is the illumination of the Check Engine Light on the vehicle's dashboard.
  2. Rough Idling: The engine may experience rough idling or stalling at stoplights or when coming to a stop.
  3. Decreased Fuel Efficiency: A faulty EGR position sensor can lead to decreased fuel efficiency as the engine may not be running optimally.
  4. Engine Misfires: The vehicle may experience engine misfires or hesitation during acceleration.
  5. Increased Emissions: A malfunctioning EGR system can result in increased emissions, potentially causing the vehicle to fail emissions tests.

How to Fix P1404

  1. Inspect EGR Position Sensor: Check the EGR position sensor for any visible damage or corrosion. Replace if necessary.
  2. Clean EGR Valve and Passages: Remove any carbon buildup in the EGR valve and passages to ensure proper operation.
  3. Check Wiring: Inspect the wiring harness connected to the EGR position sensor for any damage or loose connections. Repair or replace as needed.
  4. Test EGR System: Use a scan tool to test the EGR system and ensure that the sensor is sending accurate signals to the engine control module.
  5. Clear Codes: After completing the repairs, clear the diagnostic trouble codes and test drive the vehicle to verify that the issue has been resolved.

Cost to Fix P1404

The cost of repairing a P1404 code can vary depending on the specific cause of the issue and the make and model of the vehicle. On average, the cost of parts for this repair can range from $50 to $200, with labor costs adding an additional $100 to $300. Overall, the total cost of addressing the P1404 code typically falls between $150 and $500. As mentioned earlier, actual repair costs can fluctuate based on location, labor rates, and other factors, so it's recommended to obtain quotes from local auto repair shops for a more accurate estimate.

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Code P1404 Information for Specific Makes

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.

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