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P0304 2005 Nissan Pathfinder Code - Number 4 Cylinder Misfire Detected

Quick Answer

The P0304 diagnostic trouble code in a 2005 Nissan Pathfinder indicates that there is a misfire detected in the number four cylinder of the engine. Common causes include Worn-out or fouled spark plugs, Faulty ignition coil, Clogged or malfunctioning 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 2005 Nissan Pathfinder indicates Number 4 Cylinder Misfire Detected.
Common causes
Common causes include Worn-out or fouled spark plugs, Faulty ignition coil, Clogged or malfunctioning 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 11, 2024
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Code P0304 2005 Nissan Pathfinder Description

The P0304 diagnostic trouble code in a 2005 Nissan Pathfinder indicates that there is a misfire detected in the number four cylinder of the engine. This means that the fourth cylinder is not consistently firing as it should, leading to a disruption in the engine's combustion process. Misfires can cause a lack of power, rough idling, poor fuel economy, and increased emissions. Ignoring this issue can lead to further damage to the engine, including catalytic converter failure, increased engine wear, and decreased overall performance.

OBDII Code P0304 2005 Nissan Pathfinder - Number 4 Cylinder Misfire Detected
P0304 2005 Nissan Pathfinder Code - Number 4 Cylinder Misfire Detected

Common Causes of P0304 2005 Nissan Pathfinder

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

Symptoms of P0304 2005 Nissan Pathfinder

  1. Rough idling or shaking of the vehicle
  2. Loss of power or acceleration
  3. Engine hesitation or stumbling during acceleration
  4. Illumination of the check engine light
  5. Increased fuel consumption

How to Fix P0304 2005 Nissan Pathfinder

  1. Diagnose the specific cause of the misfire by performing a comprehensive engine inspection and using a scan tool to identify the misfiring cylinder.
  2. Replace the spark plugs in the number four cylinder, ensuring they are properly gapped and torqued to manufacturer specifications.
  3. Test the ignition coil in the number four cylinder to ensure it is functioning correctly, replacing it if necessary.
  4. Check the fuel injector in the number four cylinder for clogs or malfunctions, cleaning or replacing it as needed.
  5. Inspect the intake manifold for vacuum leaks, repairing any leaks found to prevent further misfires.

Cost to Fix P0304 2005 Nissan Pathfinder

The cost of repairing a misfire in the number four cylinder of a 2005 Nissan Pathfinder can vary depending on the specific cause of the issue and the cost of parts and labor in your area. On average, you can expect to pay between $100 and $500 for parts and labor to address this problem. Keep in mind that diagnostic time and labor rates at auto repair shops can vary, so it's recommended to get a few quotes from different shops to find the best price. Additionally, the cost may be higher if additional repairs or parts are needed to fully resolve the misfire issue.

What does this mean?

Tech Notes for P0304 2005 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 2005 Nissan Pathfinder Code

1. What are common symptoms of OBDII code P0304 on a 2005 Nissan Pathfinder?

Symptoms may include rough idle, loss of power, engine misfires, and potentially increased fuel consumption.

2. What does the OBDII code P0304 indicate on a 2005 Nissan Pathfinder?

The code indicates a misfire in the number 4 cylinder of the engine.

3. What are some possible causes of a number 4 cylinder misfire in a 2005 Nissan Pathfinder?

Causes can include faulty spark plugs, a malfunctioning ignition coil, vacuum leaks, low compression, or issues with the fuel injection system.

4. How can I diagnose the cause of a number 4 cylinder misfire on my 2005 Nissan Pathfinder?

Diagnosis typically involves checking spark plugs, ignition coils, fuel injectors, compression levels, and vacuum lines for any signs of damage or malfunction.

5. Can driving with OBDII code P0304 on a 2005 Nissan Pathfinder cause further damage?

Continuing to drive with a cylinder misfire can potentially damage the catalytic converter and other engine components, so it's best to address the issue promptly.

6. How can I repair OBDII code P0304 on my 2005 Nissan Pathfinder?

Repairs may involve replacing spark plugs, ignition coils, addressing vacuum leaks, performing a compression test, or cleaning/replacing fuel injectors as needed.

7. Is it safe to continue driving my 2005 Nissan Pathfinder with a number 4 cylinder misfire?

It is not recommended to drive your vehicle with a misfire, as it can lead to further damage and potentially unsafe driving conditions.

8. Will resetting the OBDII code P0304 on a 2005 Nissan Pathfinder fix the issue?

Resetting the code may temporarily eliminate the warning light, but it will not fix the underlying problem causing the cylinder misfire.

9. How much does it typically cost to repair OBDII code P0304 on a 2005 Nissan Pathfinder?

The cost of repairs can vary depending on the specific cause of the misfire, but it may range from a few hundred to over a thousand dollars, depending on the parts and labor required.

10. Can a DIY enthusiast fix OBDII code P0304 on a 2005 Nissan Pathfinder?

Depending on the individual's skill level and access to tools, some DIY enthusiasts may be able to address certain causes of the misfire, such as replacing spark plugs. However, more complex issues may require professional diagnosis and repair.

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