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P0404 Mitsubishi Code - Exhaust Gas Recirculation Position Sensor Circuit Performance

Quick Answer

The P0404 Mitsubishi code indicates a problem with the Exhaust Gas Recirculation (EGR) system's position sensor circuit performance. Common causes include Faulty EGR position sensor, Wiring or connector issues in the EGR position sensor circuit, Vacuum leaks in the EGR system. 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 Mitsubishi indicates Exhaust Gas Recirculation Position Sensor Circuit Performance.
Common causes
Common causes include Faulty EGR position sensor, Wiring or connector issues in the EGR position sensor circuit, Vacuum leaks in the EGR system.
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 12, 2024
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Code P0404 Mitsubishi Description

The P0404 Mitsubishi code indicates a problem with the Exhaust Gas Recirculation (EGR) system's position sensor circuit performance. The EGR system is responsible for recirculating a portion of the engine's exhaust gas back into the intake manifold to reduce emissions and control combustion temperatures. The position sensor is a crucial component that monitors the EGR valve's position and ensures that it opens and closes at the correct times.

OBDII Code P0404 Mitsubishi - Exhaust Gas Recirculation Position Sensor Circuit Performance
P0404 Mitsubishi Code - Exhaust Gas Recirculation Position Sensor Circuit Performance

Common Causes of P0404 Mitsubishi

  1. Faulty EGR position sensor.
  2. Wiring or connector issues in the EGR position sensor circuit.
  3. Vacuum leaks in the EGR system.
  4. ECM malfunction.
  5. Carbon buildup in the EGR system.

Symptoms of P0404 Mitsubishi

  1. Check Engine Light is illuminated on the dashboard.
  2. Reduced fuel efficiency.
  3. Rough idling or stalling when coming to a stop.
  4. Engine hesitation or lack of power during acceleration.
  5. Increased emissions output during emissions testing.

How to Fix P0404 Mitsubishi

  1. Diagnose the EGR system using a scan tool to verify the P0404 code.
  2. Inspect the EGR position sensor, wiring, and connectors for any signs of damage or corrosion.
  3. Test the EGR valve's operation and vacuum lines for leaks or restrictions.
  4. Replace the EGR position sensor if it is found to be faulty.
  5. Clear the code and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0404 Mitsubishi

The cost of repairing a P0404 Mitsubishi code can vary depending on the specific cause of the issue and the labor rates at the auto repair shop. In general, replacing the EGR position sensor can cost between $150 to $300, including parts and labor. Additional costs may apply if other components in the EGR system need to be replaced or if further diagnostics are required. It's recommended to consult with a trusted mechanic or dealership to get an accurate cost estimate based on your vehicle's make and model.

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 Mitsubishi Code

1. What are the common symptoms of OBDII code P0404 in a Mitsubishi related to the Exhaust Gas Recirculation (EGR) Position Sensor Circuit Performance?

The common symptoms include rough idling, decreased fuel efficiency, engine hesitation, and the illumination of the Check Engine Light.

2. What are the possible causes of OBDII code P0404 in a Mitsubishi?

The code P0404 in a Mitsubishi could be triggered by a faulty EGR position sensor, a clogged EGR valve, damaged wiring in the EGR system, or a problem with the EGR control solenoid.

3. How can I diagnose the cause of OBDII code P0404 in my Mitsubishi?

To diagnose the issue, you can use an OBDII scanner to read the code and perform a visual inspection of the EGR system components for any signs of damage or blockages. You may also need to test the EGR position sensor and related wiring for proper functionality.

4. Is it safe to continue driving my Mitsubishi with OBDII code P0404 triggered?

While it may be safe to drive your vehicle with this code in the short term, it is recommended to address the underlying issue promptly to prevent potential long-term damage to the engine or emissions system.

5. How can I repair OBDII code P0404 in my Mitsubishi?

Repairing code P0404 may involve replacing the EGR position sensor, cleaning or replacing the EGR valve, repairing damaged wiring, or addressing any other specific component that is causing the circuit performance issue.

6. Can a DIY enthusiast fix OBDII code P0404 in a Mitsubishi?

Yes, depending on your level of automotive knowledge and experience, you may be able to address the issue yourself by following repair guides or tutorials specific to your Mitsubishi model.

7. Will resetting the Check Engine Light resolve OBDII code P0404 in my Mitsubishi?

Simply resetting the Check Engine Light may temporarily clear the code, but it will not fix the underlying issue causing code P0404. It is essential to diagnose and repair the problem to prevent the code from reappearing.

8. How much does it typically cost to repair OBDII code P0404 in a Mitsubishi at a professional mechanic or dealership?

The cost of repairing code P0404 can vary depending on the specific cause of the issue, the labor rates of the service provider, and the cost of any replacement parts needed. It is advisable to obtain quotes from different repair shops for an accurate estimate.

9. Are there any preventive maintenance tips to avoid OBDII code P0404 in a Mitsubishi?

Regularly servicing your Mitsubishi according to the manufacturer's recommended maintenance schedule, using high-quality fuel, and ensuring the EGR system is clean and functioning properly can help prevent issues that lead to code P0404.

10. What other related OBDII codes might be triggered along with P0404 in a Mitsubishi?

Codes related to the EGR system, such as P0401 (EGR Flow Insufficient) or P0402 (EGR Flow Excessive), may also be triggered along with P0404 in a Mitsubishi experiencing EGR-related issues.

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