Engine-Codes.com
Engine-Codes – Nissan – P0304 2009 Nissan Altima Sedan

P0304 2009 Nissan Altima Sedan Code - Number 4 Cylinder Misfire Detected

Quick Answer

When a diagnostic trouble code P0304 appears on a 2009 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 or ignition coils, Clogged fuel injectors, Vacuum leaks in the intake manifold. 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 Altima Sedan indicates Number 4 Cylinder Misfire Detected.
Common causes
Common causes include Faulty spark plugs or ignition coils, Clogged fuel injectors, Vacuum leaks in the intake manifold.
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
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P0304 2009 Nissan Altima Sedan Description

When a diagnostic trouble code P0304 appears on a 2009 Nissan Altima Sedan, it indicates that a misfire has been detected in the number 4 cylinder of the engine. A misfire occurs when the fuel-air mixture in the cylinder fails to ignite at the correct time, leading to a disruption in the combustion process. This can result in a rough idle, loss of power, decreased fuel efficiency, and potentially harmful emissions.

OBDII Code P0304 2009 Nissan Altima Sedan - Number 4 Cylinder Misfire Detected
P0304 2009 Nissan Altima Sedan Code - Number 4 Cylinder Misfire Detected

Common Causes of P0304 2009 Nissan Altima Sedan

  1. Faulty spark plugs or ignition coils
  2. Clogged fuel injectors
  3. Vacuum leaks in the intake manifold
  4. Low compression in the number 4 cylinder
  5. Issues with the engine control module (ECM) or wiring

Symptoms of P0304 2009 Nissan Altima Sedan

  1. Rough idle or engine vibrations
  2. Loss of power or acceleration
  3. Increased fuel consumption
  4. Engine hesitation or stumbling
  5. Illumination of the Check Engine Light

How to Fix P0304 2009 Nissan Altima Sedan

  1. Diagnose the specific cause of the misfire by performing a thorough inspection of the ignition system, fuel system, and engine components.
  2. Replace the spark plugs and ignition coils in the number 4 cylinder, if necessary.
  3. Clean or replace clogged fuel injectors to ensure proper fuel delivery.
  4. Check for vacuum leaks and repair any damaged hoses or gaskets.
  5. Conduct a compression test on the number 4 cylinder to verify engine health and address any low compression issues.

Cost to Fix P0304 2009 Nissan Altima Sedan

The typical repair costs for addressing a P0304 code on a 2009 Nissan Altima Sedan can range from $100 to $500, depending on the specific cause of the misfire and the parts needed for the repair. This estimate includes the cost of spark plugs, ignition coils, fuel injectors, and any additional components that may need to be replaced. It's important to note that labor rates at auto repair shops can vary, so it's advisable to obtain quotes from multiple sources to ensure a competitive price.

What does this mean?

Tech Notes for P0304 2009 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.

Need more information about the P0304 2009 Nissan Altima Sedan code?

Need more information on how to fix the P0304 2009 Nissan Altima Sedan code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0304 2009 Nissan Altima Sedan code diagnosed by a professional: Find a repair shop in your area

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 Altima Sedan Code

1. What are some common symptoms of OBDII code P0304 on a 2009 Nissan Altima Sedan?

Symptoms may include engine misfires, rough idling, loss of power, and an illuminated check engine light.

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

Common causes can include faulty spark plugs, ignition coils, fuel injectors, vacuum leaks, or issues with the engine's compression.

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

Diagnosis typically involves using a scan tool to check for additional trouble codes, performing a cylinder balance test, inspecting spark plugs and ignition components, and checking for vacuum leaks.

4. Can driving with OBDII code P0304 on a 2009 Nissan Altima Sedan cause further damage to the vehicle?

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

5. Are there any simple maintenance tasks I can perform to help prevent OBDII code P0304 in my 2009 Nissan Altima Sedan?

Regularly changing spark plugs, maintaining a clean air filter, using high-quality fuel, and following the manufacturer's recommended service intervals can help prevent misfire issues.

6. How much can I expect to pay for repairs related to OBDII code P0304 on a 2009 Nissan Altima Sedan?

The cost of repairs can vary depending on the underlying cause of the misfire, but it's a good idea to budget for diagnostic fees, replacement parts, and potential labor costs.

7. Can I drive my 2009 Nissan Altima Sedan with the check engine light on due to code P0304?

While you may be able to drive the vehicle for a short distance, it's recommended to have the issue addressed as soon as possible to prevent further damage and ensure optimal performance.

8. Will resetting the check engine light resolve OBDII code P0304 on a 2009 Nissan Altima Sedan?

Simply resetting the check engine light without addressing the underlying issue will not fix the misfire problem. It's important to diagnose and repair the root cause of the code.

9. Is it safe to attempt DIY repairs for OBDII code P0304 on a 2009 Nissan Altima Sedan?

Depending on your skill level and access to tools, you may be able to perform some basic maintenance tasks like replacing spark plugs. However, more complex diagnostics and repairs may require professional assistance.

10. How long does it typically take to fix OBDII code P0304 on a 2009 Nissan Altima Sedan?

The repair time can vary based on the specific cause of the misfire and the complexity of the fix. Simple tasks like replacing spark plugs may take an hour or less, while diagnosing and repairing more intricate issues can take longer.

Discuss the causes and fixes for P0304 2009 Nissan Altima Sedan OBDII Code

Submit a New Comment

Code P0304 2009 Nissan Altima Sedan comments

No comments found for this page.