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P1402 Nissan Code - EGR Function Open

Quick Answer

The P1402 Nissan code indicates a problem with the Exhaust Gas Recirculation (EGR) system in the vehicle. Common causes include Faulty EGR Valve: The EGR valve may be stuck open or closed, causing the system to malfunction, Clogged EGR Passage: Build-up of carbon deposits or debris in the EGR passage can restrict the flow of exhaust gas, Wiring Issues: Electrical faults or damaged wiring can prevent the EGR system from operating correctly. 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
P1402 Nissan indicates EGR Function Open.
Common causes
Common causes include Faulty EGR Valve: The EGR valve may be stuck open or closed, causing the system to malfunction, Clogged EGR Passage: Build-up of carbon deposits or debris in the EGR passage can restrict the flow of exhaust gas, Wiring Issues: Electrical faults or damaged wiring can prevent the EGR system from operating correctly.
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 30, 2024
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Code P1402 Nissan Description

The P1402 Nissan code indicates a problem with the Exhaust Gas Recirculation (EGR) system 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 and control combustion temperatures. When the EGR function is open, it means that the system is not functioning properly, which can lead to an increase in emissions and a decrease in fuel efficiency. This issue can also cause the engine to run rough, misfire, and potentially lead to engine damage if not addressed promptly.

OBDII Code P1402 Nissan - EGR Function Open
P1402 Nissan Code - EGR Function Open

Common Causes of P1402 Nissan

  1. Faulty EGR Valve: The EGR valve may be stuck open or closed, causing the system to malfunction.
  2. Clogged EGR Passage: Build-up of carbon deposits or debris in the EGR passage can restrict the flow of exhaust gas.
  3. Wiring Issues: Electrical faults or damaged wiring can prevent the EGR system from operating correctly.
  4. Vacuum Leaks: Any leaks in the vacuum lines connected to the EGR system can disrupt its function.

Symptoms of P1402 Nissan

  1. Check Engine Light: The most common symptom associated with this code is the illumination of the check engine light on the dashboard.
  2. Rough Idle: The engine may idle roughly or inconsistently, which can be felt as vibrations in the vehicle.
  3. Reduced Fuel Efficiency: A malfunctioning EGR system can cause a decrease in fuel efficiency, leading to more frequent trips to the gas station.
  4. Engine Misfire: The engine may misfire or hesitate during acceleration, impacting overall performance.

How to Fix P1402 Nissan

  1. Diagnose the Issue: Use a diagnostic scanner to retrieve the specific trouble code and pinpoint the exact cause of the EGR function open problem.
  2. Inspect EGR Valve: Check the EGR valve for proper operation and clean or replace it if necessary.
  3. Clean EGR Passage: Remove any carbon deposits or debris from the EGR passage to ensure proper flow of exhaust gas.
  4. Check Wiring: Inspect the wiring and connections related to the EGR system for any damage or corrosion, repairing or replacing as needed.
  5. Test Drive and Clear Codes: After completing the repairs, test drive the vehicle to ensure the issue has been resolved, and clear the trouble codes to turn off the check engine light.

Cost to Fix P1402 Nissan

The typical repair costs for addressing a P1402 Nissan code can range from $150 to $400, including parts and labor. However, prices can vary depending on the location, vehicle make and model, and the specific repairs needed. It's recommended to consult with a qualified mechanic or auto repair shop for an accurate estimate based on the individual circumstances.

What does this mean?

Tech Notes for P1402 Nissan

Start by cleaning the EGR valve, if the code persists it may be necessary to replace the EGR Valve.

There is a Factory Service Bulletin for the following Nissan Models:

2004-2005 Nissan Maxima
2004-2005 Nissan Quest
2005 Nissan Altima
Nissan Factory Service Bulletin OBDII Code P1402

Need more information about the P1402 Nissan code?

Need more information on how to fix the P1402 Nissan code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1402 Nissan code diagnosed by a professional: Find a repair shop in your area

Information for Specific Nissan Models

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 P1402 Nissan Code

1. What does the OBDII code P1402 mean on a Nissan?

P1402 indicates an issue with the EGR system, specifically that the EGR valve is stuck open or functioning improperly.

2. What are the symptoms of the P1402 code on a Nissan?

Symptoms may include rough idling, decreased fuel efficiency, engine hesitation, or stalling, as well as the Check Engine Light turning on.

3. What causes the P1402 code on a Nissan?

Common causes include a stuck EGR valve, carbon buildup in the EGR passages, a faulty EGR temperature sensor, or damaged wiring.

4. Can driving with the P1402 code damage my Nissan?

Driving with this code can lead to engine performance issues and may cause long-term damage due to improper air-fuel mixture and overheating.

5. How can I diagnose the P1402 code on a Nissan?

Diagnosis involves inspecting the EGR valve for blockage or damage, checking the EGR temperature sensor, and testing wiring and connectors for continuity.

6. What tools do I need to fix the P1402 code on a Nissan?

You’ll need an OBDII scanner, a multimeter, basic hand tools, and possibly cleaning supplies for carbon buildup removal.

7. Is replacing the EGR valve the only solution for the P1402 code?

No, the issue could also be solved by cleaning the EGR passages or repairing wiring issues, depending on the root cause.

8. How much does it cost to fix the P1402 code on a Nissan?

The repair cost varies but typically ranges from $150 to $500, depending on whether parts need replacement or just cleaning.

9. Can I fix the P1402 code on my Nissan myself?

If you’re comfortable with basic car repairs and diagnostics, you may be able to clean the EGR valve or replace it yourself.

10. What happens if I ignore the P1402 code on my Nissan?

Ignoring this code can lead to reduced engine performance, increased emissions, and potential damage to other components like the catalytic converter.

Discuss the causes and fixes for P1402 Nissan OBDII Code

Submit a New Comment

  • avoir un chémat ou son placé les pieces serais aprécier merci

    Reply to Comment

  • Quel est le modèle et l'année de votre Nissan

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  • Nissan Sentra 1998 1.6L service engine soon light comes on trouble code P1402 comes up changed egr valve and egr temperature sensor light still comes on

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  • The P1402 code means that the EGR valve is always open and that can only be caused by a faulty EGR valve or EGR Solenoid Valve. Since you have already replaced the EGR valve, at this point you probably have to replaced the EGR Solenoid Valve.

    Reply to Comment

  • J'ai ce code sur ma Maxima 2004 ou est-ce que cette piece ce trouve j'aimerai avoir un shema

    Reply to Comment