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P0304 2009 Nissan Pathfinder Code - Number 4 Cylinder Misfire Detected

Quick Answer

When a diagnostic trouble code P0304 is triggered in a 2009 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 2009 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 2009 Nissan Pathfinder Description

When a diagnostic trouble code P0304 is triggered in a 2009 Nissan Pathfinder, it indicates that a misfire has been detected in the number 4 cylinder of the engine. This misfire can lead to a range of performance issues, including rough idling, decreased fuel efficiency, loss of power, and potentially even engine stalling. The misfire occurs when the fuel-air mixture in the cylinder fails to ignite at the proper time, causing a disruption in the combustion process.

OBDII Code P0304 2009 Nissan Pathfinder - Number 4 Cylinder Misfire Detected
P0304 2009 Nissan Pathfinder Code - Number 4 Cylinder Misfire Detected

Common Causes of P0304 2009 Nissan Pathfinder

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

Symptoms of P0304 2009 Nissan Pathfinder

  1. Rough idling
  2. Decreased fuel efficiency
  3. Loss of power
  4. Engine vibration
  5. Illuminated check engine light

How to Fix P0304 2009 Nissan Pathfinder

  1. Begin by performing a thorough diagnostic scan to confirm the P0304 code and identify the specific cylinder misfire.
  2. Inspect and replace the spark plugs in the number 4 cylinder, ensuring they are properly gapped and torqued.
  3. Test the ignition coil for proper function and replace if necessary.
  4. Clean or replace the fuel injector in the affected cylinder to ensure proper fuel delivery.
  5. Check for vacuum leaks and repair as needed to prevent air leaks that could disrupt the air-fuel mixture.

Cost to Fix P0304 2009 Nissan Pathfinder

The typical repair costs for addressing a cylinder misfire in a 2009 Nissan Pathfinder can vary depending on the specific cause of the issue. In general, the cost of parts such as spark plugs, ignition coils, and fuel injectors can range from $50 to $200 each. Labor rates at auto repair shops typically fall between $80 and $150 per hour, with the total repair time varying based on the complexity of the issue. Overall, the total cost of addressing a P0304 code in a 2009 Nissan Pathfinder could range from $150 to $600 or more, depending on the extent of the repairs needed. It's advisable to consult with a trusted mechanic to obtain a more accurate estimate based on your vehicle's specific needs and location.

What does this mean?

Tech Notes for P0304 2009 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 2009 Nissan Pathfinder Code

1. What are common symptoms of OBDII code P0304 on a 2009 Nissan Pathfinder?

- Common symptoms include rough idling, engine vibration, loss of power, and potentially increased fuel consumption.

2. What are the possible causes of a number 4 cylinder misfire detected in a 2009 Nissan Pathfinder?

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

3. How can I diagnose the cause of the number 4 cylinder misfire in my 2009 Nissan Pathfinder?

- Diagnostic steps may include checking spark plugs, inspecting ignition coils, testing fuel injectors, performing a compression test, and scanning the ECM for fault codes.

4. Can driving with a P0304 code on a 2009 Nissan Pathfinder cause further damage?

- Continuing to drive with a cylinder misfire can potentially lead to damage to the catalytic converter, so it is recommended to address the issue promptly.

5. How can I repair a number 4 cylinder misfire in my 2009 Nissan Pathfinder?

- Depending on the cause, repairs may involve replacing spark plugs, ignition coils, fuel injectors, addressing vacuum leaks, performing a compression test, or reprogramming the ECM.

6. Is it safe to drive my 2009 Nissan Pathfinder with a flashing check engine light and code P0304?

- A flashing check engine light indicates a severe misfire that can cause damage to the catalytic converter. It is not recommended to drive the vehicle in this condition.

7. What should I do if the number 4 cylinder misfire persists after repairs on my 2009 Nissan Pathfinder?

- If the misfire persists, further diagnosis may be needed to identify the root cause, such as checking for wiring issues, verifying proper fuel delivery, or consulting a professional mechanic.

8. Can bad gasoline or fuel quality trigger a P0304 code in a 2009 Nissan Pathfinder?

- Poor quality gasoline or fuel contaminated with water or debris can potentially lead to misfires, including a number 4 cylinder misfire.

9. How often should spark plugs be replaced in a 2009 Nissan Pathfinder to prevent misfire codes like P0304?

- It is generally recommended to replace spark plugs every 30,000 to 100,000 miles, depending on the type of plugs used in the vehicle.

10. Are there any preventative maintenance tips to help avoid a number 4 cylinder misfire in a 2009 Nissan Pathfinder?

- Regularly servicing the ignition system, fuel system, and engine components, as well as using high-quality fuel, can help prevent misfires and related codes like P0304.

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