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P0304 2008 Nissan Pathfinder Code - Number 4 Cylinder Misfire Detected

Quick Answer

When a diagnostic trouble code P0304 is triggered in a 2008 Nissan Pathfinder, it indicates that a misfire has been detected in the number 4 cylinder of the engine. Common causes include Worn or fouled spark plugs, Faulty ignition coil, Clogged fuel injector. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P0304 2008 Nissan Pathfinder indicates Number 4 Cylinder Misfire Detected.
Common causes
Common causes include Worn or fouled spark plugs, Faulty ignition coil, Clogged fuel injector.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 14, 2024
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Code P0304 2008 Nissan Pathfinder Description

When a diagnostic trouble code P0304 is triggered in a 2008 Nissan Pathfinder, it indicates that a misfire has been detected in the number 4 cylinder of the engine. This misfire can lead to a variety of issues that can affect the vehicle's performance, fuel efficiency, and overall drivability. The misfire occurs when the air-fuel mixture in the cylinder does not ignite properly, causing a disruption in the combustion process. This can result in a loss of power, rough idling, hesitation during acceleration, and increased emissions.

OBDII Code P0304 2008 Nissan Pathfinder - Number 4 Cylinder Misfire Detected
P0304 2008 Nissan Pathfinder Code - Number 4 Cylinder Misfire Detected

Common Causes of P0304 2008 Nissan Pathfinder

  1. Worn or fouled spark plugs
  2. Faulty ignition coil
  3. Clogged fuel injector
  4. Vacuum leaks
  5. Low compression in the number 4 cylinder

Symptoms of P0304 2008 Nissan Pathfinder

  1. Rough idling
  2. Loss of power
  3. Hesitation during acceleration
  4. Increased fuel consumption
  5. Engine vibration

How to Fix P0304 2008 Nissan Pathfinder

  1. Begin by diagnosing the specific cause of the misfire, such as testing the spark plugs, ignition coil, fuel injector, and compression in the cylinder.
  2. Replace any faulty spark plugs or ignition coils in the number 4 cylinder.
  3. Clean or replace the clogged fuel injector if necessary.
  4. Check for and repair any vacuum leaks in the intake system.
  5. Perform a compression test on the number 4 cylinder to ensure proper compression.

Cost to Fix P0304 2008 Nissan Pathfinder

The typical repair costs for addressing a misfire in the number 4 cylinder of a 2008 Nissan Pathfinder can vary depending on the specific cause of the issue. On average, the cost of replacing spark plugs and ignition coils can range from $100 to $300, while cleaning or replacing a fuel injector may cost between $50 and $200. Diagnostic testing and labor costs can add an additional $100 to $300 to the total repair bill. It is important to note that labor rates at auto repair shops can vary, so it is recommended to obtain quotes from multiple sources to determine the most accurate cost estimate for your specific situation.

What does this mean?

Tech Notes for P0304 2008 Nissan Pathfinder

The P0304 code means that cylinder #4 is misfiring or is randomly misfiring. Start by checking for intake leaks and if no leaks are found the next step is to replace the spark plugs on cylinder #4. If the problem persists more tests need to be done to diagnose the problem. See "Possible Causes" for the most common problems.

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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 P0304 2008 Nissan Pathfinder Code

1. What are the common symptoms of OBDII code P0304 on a 2008 Nissan Pathfinder?

- Common symptoms include engine misfires, rough idling, loss of power, and potentially an illuminated check engine light.

2. What are the possible causes of a number 4 cylinder misfire detected in a 2008 Nissan Pathfinder?

- Possible causes can include faulty spark plugs, ignition coils, fuel injectors, vacuum leaks, low compression, or issues with the engine control module.

3. How can I diagnose the source of the number 4 cylinder misfire in my 2008 Nissan Pathfinder?

- Diagnosis typically involves performing a thorough inspection of the spark plugs, ignition coils, fuel injectors, and conducting a compression test to pinpoint the issue.

4. Can driving with OBDII code P0304 on a 2008 Nissan Pathfinder cause further damage?

- Continued driving with a misfire can potentially lead to damage to the catalytic converter, oxygen sensor, or other engine components, so it's important to address the issue promptly.

5. Is it safe to continue driving my 2008 Nissan Pathfinder with a number 4 cylinder misfire?

- It is not recommended to drive the vehicle with a misfire as it can affect engine performance and lead to further issues. It's best to have the problem diagnosed and repaired as soon as possible.

6. How much does it typically cost to repair OBDII code P0304 on a 2008 Nissan Pathfinder?

- The cost of repair can vary depending on the underlying cause of the misfire, but it may involve replacing spark plugs, ignition coils, or addressing other related issues. Costs can range from a few hundred to over a thousand dollars.

7. Are there any DIY repair tips for addressing a number 4 cylinder misfire in a 2008 Nissan Pathfinder?

- DIY enthusiasts can start by inspecting and potentially replacing the spark plugs and ignition coils. However, for more complex issues, it's recommended to seek professional help.

8. How long does it typically take to repair OBDII code P0304 on a 2008 Nissan Pathfinder?

- The repair time can vary depending on the exact cause of the misfire and the extent of the repairs needed. It may take anywhere from a couple of hours to a full day in some cases.

9. Can a number 4 cylinder misfire in a 2008 Nissan Pathfinder be fixed without professional help?

- While some minor misfire issues can potentially be addressed by DIY enthusiasts, more complex problems may require the expertise of a professional mechanic to properly diagnose and repair.

10. Will resetting the OBDII code P0304 on a 2008 Nissan Pathfinder make the issue go away?

- Simply resetting the code will not fix the underlying problem causing the misfire. It's important to address the root cause of the issue to prevent further issues and potential damage to the vehicle.

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