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P0304 2011 Nissan Sentra Code - Number 4 Cylinder Misfire Detected

Quick Answer

The P0304 diagnostic trouble code (DTC) indicates that a misfire has been detected in the number 4 cylinder of a 2011 Nissan Sentra. Common causes include Worn 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 2011 Nissan Sentra indicates Number 4 Cylinder Misfire Detected.
Common causes
Common causes include Worn 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 14, 2024
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Code P0304 2011 Nissan Sentra Description

The P0304 diagnostic trouble code (DTC) indicates that a misfire has been detected in the number 4 cylinder of a 2011 Nissan Sentra. A misfire occurs when the fuel-air mixture in the cylinder fails to ignite properly, leading to a disruption in the combustion process. This can result in a loss of power, rough idling, decreased fuel efficiency, and increased emissions.

OBDII Code P0304 2011 Nissan Sentra - Number 4 Cylinder Misfire Detected
P0304 2011 Nissan Sentra Code - Number 4 Cylinder Misfire Detected

Common Causes of P0304 2011 Nissan Sentra

  1. Worn 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 4 cylinder

Symptoms of P0304 2011 Nissan Sentra

  1. Check engine light illuminated
  2. Rough idling or vibrations while driving
  3. Loss of power or acceleration
  4. Engine misfires or hesitation during acceleration
  5. Increased fuel consumption

How to Fix P0304 2011 Nissan Sentra

  1. Perform a visual inspection of the spark plugs, ignition coil, and fuel injector for any signs of damage or wear.
  2. Test the compression in the number 4 cylinder to ensure it is within the manufacturer's specifications.
  3. Use a scan tool to monitor live data and identify any potential issues with the fuel system or ignition timing.
  4. Replace any faulty components, such as spark plugs, ignition coils, or fuel injectors, as needed.
  5. Clear the DTC and test drive the vehicle to verify that the misfire has been resolved.

Cost to Fix P0304 2011 Nissan Sentra

The cost of repairing a number 4 cylinder misfire in a 2011 Nissan Sentra 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 $300 for parts, including spark plugs, ignition coils, or fuel injectors. Labor costs can range from $100 to $300, with total repair costs typically falling between $200 and $600. Keep in mind that diagnostic time and labor rates can vary, so it's best to consult with a trusted mechanic for a more accurate estimate based on your location and vehicle.

What does this mean?

Tech Notes for P0304 2011 Nissan Sentra

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 2011 Nissan Sentra Code

1. What are the common symptoms of an OBDII code P0304 in a 2011 Nissan Sentra?

A: Common symptoms of a P0304 code include engine misfires, rough idling, loss of power, and increased fuel consumption.

2. What are the possible causes of a number 4 cylinder misfire detected in a 2011 Nissan Sentra?

A: The P0304 code in a 2011 Nissan Sentra can be caused by issues such as faulty spark plugs, ignition coils, fuel injectors, vacuum leaks, or a problem with the engine's compression.

3. How can I diagnose the cause of a number 4 cylinder misfire in my 2011 Nissan Sentra?

A: Diagnosing a P0304 code may involve checking the spark plugs, ignition coils, fuel injectors, vacuum lines, and performing a compression test to pinpoint the issue.

4. Can driving with a P0304 code in a 2011 Nissan Sentra cause further damage to the engine?

A: Continuing to drive with a P0304 code can potentially lead to damage to the catalytic converter, oxygen sensors, or other components of the engine over time.

5. Is it safe to continue driving my 2011 Nissan Sentra with a number 4 cylinder misfire detected?

A: It is not recommended to drive the vehicle with a P0304 code as it can affect the vehicle's performance and fuel efficiency. It is best to address the issue promptly.

6. What are some DIY repair tips for fixing a P0304 code in a 2011 Nissan Sentra?

A: DIY repair tips may include checking and replacing spark plugs, ignition coils, or fuel injectors, ensuring proper connection of vacuum lines, and performing a compression test.

7. How much does it typically cost to repair a number 4 cylinder misfire in a 2011 Nissan Sentra?

A: The cost of repairing a P0304 code in a 2011 Nissan Sentra can vary depending on the cause of the misfire, but it may range from $100 to $500 or more, including parts and labor.

8. Can a P0304 code be triggered by a simple issue like a loose gas cap in a 2011 Nissan Sentra?

A: While a loose gas cap is unlikely to cause a P0304 code directly, it can lead to other issues that may contribute to misfires, so it's important to ensure the gas cap is tight.

9. How often should I check for a number 4 cylinder misfire in my 2011 Nissan Sentra?

A: It is advisable to regularly monitor your vehicle for any signs of engine misfires, such as rough idling or loss of power, and address them promptly to prevent further damage.

10. Can a P0304 code in a 2011 Nissan Sentra be reset without fixing the underlying issue?

A: While you can clear the error code temporarily, the underlying issue causing the misfire must be resolved to prevent the code from reappearing.

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