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Engine-Codes – Nissan – P0304 2002 Nissan Altima Sedan

P0304 2002 Nissan Altima Sedan Code - Number 4 Cylinder Misfire Detected

Quick Answer

The diagnostic trouble code P0304 for a 2002 Nissan Altima Sedan 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 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 2002 Nissan Altima Sedan 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 13, 2024
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Code P0304 2002 Nissan Altima Sedan Description

The diagnostic trouble code P0304 for a 2002 Nissan Altima Sedan 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 proper time, leading to a disruption in the combustion process. This can result in a loss of power, rough idling, poor fuel economy, and increased emissions.

OBDII Code P0304 2002 Nissan Altima Sedan - Number 4 Cylinder Misfire Detected
P0304 2002 Nissan Altima Sedan Code - Number 4 Cylinder Misfire Detected

Common Causes of P0304 2002 Nissan Altima Sedan

  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 2002 Nissan Altima Sedan

  1. Rough idling or vibrations while driving
  2. Loss of power or acceleration
  3. Hesitation or stumbling during acceleration
  4. Engine misfires or stalling
  5. Check Engine Light illuminated on the dashboard

How to Fix P0304 2002 Nissan Altima Sedan

  1. Diagnose the specific cause of the misfire by performing a thorough inspection of the spark plugs, ignition coil, fuel injector, and compression in the number 4 cylinder.
  2. Replace any faulty spark plugs or ignition coils in the number 4 cylinder.
  3. Clean or replace clogged fuel injectors.
  4. Repair any vacuum leaks in the intake manifold.
  5. Perform a compression test to check for low compression in the number 4 cylinder and address any issues found.

Cost to Fix P0304 2002 Nissan Altima Sedan

The cost of repairing a misfire in the number 4 cylinder of a 2002 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, the repair cost for this type of issue can range from $150 to $500. It is important to note that diagnostic time and labor rates at auto repair shops can vary, so it is advisable to obtain a detailed estimate from a qualified mechanic before proceeding with the repair.

What does this mean?

Tech Notes for P0304 2002 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 2002 Nissan Altima Sedan Code

1. What are common symptoms of OBDII code P0304 in a 2002 Nissan Altima Sedan?

The common symptoms of code P0304 (Number 4 Cylinder Misfire Detected) in a 2002 Nissan Altima Sedan may include rough idling, engine vibrations, loss of power, and the Check Engine light illuminating.

2. What are the possible causes of OBDII code P0304 in a 2002 Nissan Altima Sedan?

Possible causes of code P0304 in a 2002 Nissan Altima Sedan include faulty spark plugs, a malfunctioning ignition coil, a vacuum leak, low compression in the number 4 cylinder, or issues with the fuel injector.

3. How can I diagnose the cause of OBDII code P0304 in my 2002 Nissan Altima Sedan?

To diagnose code P0304 in a 2002 Nissan Altima Sedan, you can start by checking the spark plugs, ignition coil, vacuum lines, compression in the number 4 cylinder, and the fuel injector. Using a scan tool to monitor live data can also help pinpoint the issue.

4. What should I do if my 2002 Nissan Altima Sedan is experiencing a misfire in the number 4 cylinder?

If your 2002 Nissan Altima Sedan is experiencing a misfire in the number 4 cylinder, it's essential to address the issue promptly to prevent further damage. Begin by inspecting and replacing faulty spark plugs, ignition components, and checking for any vacuum leaks.

5. Can a dirty fuel injector cause OBDII code P0304 in a 2002 Nissan Altima Sedan?

Yes, a dirty or clogged fuel injector can cause code P0304 in a 2002 Nissan Altima Sedan by affecting the fuel delivery to the number 4 cylinder, resulting in a misfire. Cleaning or replacing the fuel injector may be necessary to resolve the issue.

6. Is it safe to continue driving my 2002 Nissan Altima Sedan with OBDII code P0304?

It is not recommended to continue driving your 2002 Nissan Altima Sedan with OBDII code P0304, as a misfire can lead to further damage to the engine or emission control system. It's best to address the issue promptly to prevent more serious problems.

7. How can I clear OBDII code P0304 from my 2002 Nissan Altima Sedan's computer?

To clear OBDII code P0304 from your 2002 Nissan Altima Sedan's computer, you can use an OBDII scan tool to reset the trouble code after addressing the underlying issue causing the misfire in the number 4 cylinder.

8. Will replacing the spark plugs fix OBDII code P0304 in my 2002 Nissan Altima Sedan?

While replacing the spark plugs is a common fix for code P0304 in a 2002 Nissan Altima Sedan, it may not always solve the issue if the misfire is caused by other factors such as a faulty ignition coil, fuel injector, or low compression in the cylinder.

9. How much does it cost to repair OBDII code P0304 in a 2002 Nissan Altima Sedan?

The cost to repair OBDII code P0304 in a 2002 Nissan Altima Sedan can vary depending on the underlying cause of the misfire. Costs may include parts such as spark plugs, ignition components, or a fuel injector, as well as labor fees if the repair is done by a professional mechanic.

10. Can a DIY enthusiast fix OBDII code P0304 in a 2002 Nissan Altima Sedan?

A DIY enthusiast with the necessary tools and mechanical knowledge may be able to fix OBDII code P0304 in a 2002 Nissan Altima Sedan, especially if the issue is related to spark plugs or ignition components. However, more complex issues may require professional diagnosis and repair.

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