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P0304 2011 Nissan Altima Sedan Code - Number 4 Cylinder Misfire Detected

Quick Answer

The diagnostic trouble code P0304 for a 2011 Nissan Altima Sedan indicates that a misfire has been detected in the number 4 cylinder of the engine. Common causes include Faulty spark plug or ignition coil, Clogged fuel injector, Low fuel pressure. 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 Altima Sedan indicates Number 4 Cylinder Misfire Detected.
Common causes
Common causes include Faulty spark plug or ignition coil, Clogged fuel injector, Low fuel pressure.
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 10, 2024
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Code P0304 2011 Nissan Altima Sedan Description

The diagnostic trouble code P0304 for a 2011 Nissan Altima Sedan indicates that a misfire has been detected in the number 4 cylinder of the engine. This means that the cylinder is not firing properly, which can lead to a rough idle, decreased fuel efficiency, and potentially even engine damage if left unresolved. The misfire can be caused by a variety of factors, including issues with the ignition system, fuel system, or mechanical components of the engine.

OBDII Code P0304 2011 Nissan Altima Sedan - Number 4 Cylinder Misfire Detected
P0304 2011 Nissan Altima Sedan Code - Number 4 Cylinder Misfire Detected

Common Causes of P0304 2011 Nissan Altima Sedan

  1. Faulty spark plug or ignition coil
  2. Clogged fuel injector
  3. Low fuel pressure
  4. Vacuum leaks
  5. Engine compression issues

Symptoms of P0304 2011 Nissan Altima Sedan

  1. Rough idle or vibrations felt through the vehicle
  2. Loss of power and acceleration
  3. Engine hesitation or stumbling
  4. Increased fuel consumption
  5. Check engine light illuminated, possibly flashing

How to Fix P0304 2011 Nissan Altima Sedan

  1. Begin by diagnosing the specific cause of the misfire, such as checking the spark plugs, ignition coils, fuel injectors, and fuel pressure.
  2. Replace any faulty components, such as spark plugs, ignition coils, or fuel injectors.
  3. Perform a compression test to check for any internal engine issues that may be causing the misfire.
  4. Clear the diagnostic trouble code from the vehicle's computer and test drive to ensure the issue has been resolved.
  5. If the misfire persists, further diagnostics may be necessary to pinpoint the exact cause and address it accordingly.

Cost to Fix P0304 2011 Nissan Altima Sedan

The typical repair costs for addressing a P0304 code on a 2011 Nissan Altima Sedan can range from $100 to $500, depending on the specific cause of the misfire and the parts needed for replacement. This estimate includes both parts and labor, but actual costs may vary depending on the location, labor rates, and the severity of the issue. It is recommended to consult with a qualified mechanic or repair shop for a more accurate estimate based on the individual circumstances of the vehicle.

What does this mean?

Tech Notes for P0304 2011 Nissan Altima Sedan

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 Altima Sedan Code

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

A: Common symptoms of code P0304, indicating a misfire in the number 4 cylinder, include engine vibrations, loss of power, rough idling, and potentially increased fuel consumption.

2. What are the potential causes of a number 4 cylinder misfire in a 2011 Nissan Altima Sedan?

A: Causes of a cylinder 4 misfire can include faulty spark plugs, a malfunctioning ignition coil, a vacuum leak, low compression in the cylinder, or issues with the fuel injector.

3. How can I diagnose the source of the cylinder 4 misfire in my 2011 Nissan Altima Sedan?

A: To diagnose the misfire, you can perform a visual inspection of spark plugs and ignition components, conduct a compression test, check for vacuum leaks, and use a scan tool to monitor live engine data.

4. Can driving with OBDII code P0304 in a 2011 Nissan Altima Sedan cause further damage?

A: Continuing to drive with a cylinder 4 misfire can potentially damage the catalytic converter over time and lead to more severe engine issues, so it's advisable to address the problem promptly.

5. How can I repair OBDII code P0304 in my 2011 Nissan Altima Sedan?

A: Repair options include replacing spark plugs, ignition coils, or fuel injectors, fixing vacuum leaks, addressing compression issues, or seeking professional help for a thorough diagnosis and repair.

6. Are there any simple maintenance tips to prevent OBDII code P0304 in a 2011 Nissan Altima Sedan?

A: Regularly maintaining your vehicle by changing spark plugs at recommended intervals, using high-quality fuel, and ensuring timely tune-ups can help prevent cylinder misfires and related issues.

7. Is it safe to continue driving my 2011 Nissan Altima Sedan with a cylinder 4 misfire?

A: While it may be possible to drive short distances with a misfire, extended driving can cause damage to other engine components, so it's best to have the issue addressed as soon as possible.

8. How much can I expect to pay for repairs related to OBDII code P0304 in a 2011 Nissan Altima Sedan?

A: The cost of repairs for a cylinder 4 misfire can vary based on the specific issue but may range from a few hundred to over a thousand dollars, depending on the extent of the problem and parts needed.

9. Can a DIY enthusiast with basic tools fix OBDII code P0304 in a 2011 Nissan Altima Sedan?

A: Depending on the root cause, some DIY enthusiasts may be able to address a cylinder misfire by replacing spark plugs or ignition coils, but more complex issues may require professional assistance.

10. Will resetting the OBDII code P0304 in my 2011 Nissan Altima Sedan make the problem go away?

A: Resetting the code without addressing the underlying issue will not fix the cylinder misfire problem; it's essential to diagnose and repair the root cause to prevent the code from reappearing.

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