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Engine-Codes – Nissan – P0304 2008 Nissan Altima Sedan

P0304 2008 Nissan Altima Sedan Code - Number 4 Cylinder Misfire Detected

Quick Answer

When the diagnostic trouble code P0304 appears on a 2008 Nissan Altima Sedan, it indicates that a misfire has been detected in the number 4 cylinder of the engine. Common causes include Faulty spark plugs, Failing 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 Altima Sedan indicates Number 4 Cylinder Misfire Detected.
Common causes
Common causes include Faulty spark plugs, Failing 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 10, 2024
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Code P0304 2008 Nissan Altima Sedan Description

When the diagnostic trouble code P0304 appears on a 2008 Nissan Altima Sedan, it 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 range of performance issues. A misfire can cause rough idling, a noticeable decrease in engine power, poor fuel economy, and potentially even engine stalling. Ignoring this issue can lead to further damage to the engine and other components, as unburned fuel can damage the catalytic converter and O2 sensors.

OBDII Code P0304 2008 Nissan Altima Sedan - Number 4 Cylinder Misfire Detected
P0304 2008 Nissan Altima Sedan Code - Number 4 Cylinder Misfire Detected

Common Causes of P0304 2008 Nissan Altima Sedan

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

Symptoms of P0304 2008 Nissan Altima Sedan

  1. Rough idling
  2. Loss of power
  3. Engine vibration
  4. Decreased fuel efficiency
  5. Engine stalling

How to Fix P0304 2008 Nissan Altima Sedan

  1. Diagnose the specific cause of the misfire by checking the spark plugs, ignition coils, fuel injectors, and compression in the cylinder.
  2. Replace any faulty components identified during the diagnosis, such as spark plugs, ignition coils, or fuel injectors.
  3. Clear the diagnostic trouble code from the engine control module.
  4. Test drive the vehicle to ensure that the misfire has been resolved.
  5. Consider performing a full tune-up to prevent future misfires and maintain the engine's performance.

Cost to Fix P0304 2008 Nissan Altima Sedan

The cost of repairing a misfire in the number 4 cylinder of a 2008 Nissan Altima Sedan 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 such as spark plugs, ignition coils, or fuel injectors. Labor costs can range from $100 to $300, depending on the shop's hourly rate and the complexity of the repair. It's advisable to get quotes from multiple auto repair shops to find the best price for repairing this issue.

What does this mean?

Tech Notes for P0304 2008 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 2008 Nissan Altima Sedan Code

1. What are the common symptoms of OBDII code P0304 (Number 4 Cylinder Misfire Detected) in a 2008 Nissan Altima Sedan?

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

2. What are the possible causes of a P0304 code in a 2008 Nissan Altima Sedan?

- The code P0304 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 P0304 code in my 2008 Nissan Altima Sedan?

- Diagnosing the cause of a P0304 code typically involves checking the spark plugs, ignition coils, fuel injectors, and performing a compression test to identify the specific issue.

4. Can driving with a P0304 code in my 2008 Nissan Altima Sedan cause further damage?

- Driving with a misfire can potentially cause damage to the catalytic converter over time, so it is recommended to address the issue promptly to prevent further damage.

5. How can I repair a P0304 code in my 2008 Nissan Altima Sedan?

- Repairing a P0304 code may involve replacing faulty spark plugs, ignition coils, fuel injectors, or addressing any vacuum leaks present in the engine.

6. Are there any maintenance tips to prevent a P0304 code in my 2008 Nissan Altima Sedan?

- Regularly maintaining your vehicle by changing spark plugs, inspecting ignition components, and ensuring proper fuel system function can help prevent issues that lead to a P0304 code.

7. Can weather conditions affect the likelihood of a P0304 code in a 2008 Nissan Altima Sedan?

- Extreme weather conditions, such as very cold temperatures, can sometimes exacerbate existing issues that may trigger a misfire code like P0304.

8. Is it safe to drive my 2008 Nissan Altima Sedan with a P0304 code if the symptoms are not severe?

- While it may be possible to drive with a P0304 code if the symptoms are mild, it is best to address the issue promptly to prevent potential damage and ensure optimal performance.

9. Will resetting the OBDII system clear a P0304 code in my 2008 Nissan Altima Sedan?

- Resetting the OBDII system may temporarily clear the code, but if the underlying issue causing the misfire is not addressed, the code is likely to reappear.

10. How much can I expect to pay for repairing a P0304 code in a 2008 Nissan Altima Sedan?

- The cost of repairing a P0304 code can vary depending on the specific cause, but it may range from a relatively low cost for replacing spark plugs to a higher cost for more complex repairs like replacing ignition coils or fuel injectors.

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