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P0304 2006 Nissan Altima Sedan Code - Number 4 Cylinder Misfire Detected

Quick Answer

When a diagnostic trouble code P0304 is triggered in a 2006 Nissan Altima Sedan, it 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 in the number 4 cylinder, 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 2006 Nissan Altima Sedan indicates Number 4 Cylinder Misfire Detected.
Common causes
Common causes include Worn or fouled spark plugs, Faulty ignition coil in the number 4 cylinder, 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 15, 2024
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Code P0304 2006 Nissan Altima Sedan Description

When a diagnostic trouble code P0304 is triggered in a 2006 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, reduced power, decreased fuel efficiency, and potentially even engine damage if left unresolved.

OBDII Code P0304 2006 Nissan Altima Sedan - Number 4 Cylinder Misfire Detected
P0304 2006 Nissan Altima Sedan Code - Number 4 Cylinder Misfire Detected

Common Causes of P0304 2006 Nissan Altima Sedan

  1. Worn or fouled spark plugs.
  2. Faulty ignition coil in the number 4 cylinder.
  3. Clogged or malfunctioning fuel injector.
  4. Vacuum leaks in the intake manifold.
  5. Low compression in the number 4 cylinder.

Symptoms of P0304 2006 Nissan Altima Sedan

  1. Rough idling or vibrations while the engine is running.
  2. Loss of power or acceleration.
  3. Increased fuel consumption.
  4. Engine hesitation or stumbling during acceleration.
  5. Illumination of the check engine light on the dashboard.

How to Fix P0304 2006 Nissan Altima Sedan

  1. Begin by diagnosing the specific cause of the misfire, such as testing the spark plugs, ignition coil, fuel injector, and compression in the number 4 cylinder.
  2. Replace any faulty components identified during the diagnostic process, such as worn spark plugs, a defective ignition coil, or a clogged fuel injector.
  3. Check for and repair any vacuum leaks in the intake manifold.
  4. Perform a compression test on the number 4 cylinder to ensure that it is within the manufacturer's specified range.
  5. Clear the diagnostic trouble code from the vehicle's computer and test drive the vehicle to confirm that the issue has been resolved.

Cost to Fix P0304 2006 Nissan Altima Sedan

The cost of repairing a P0304 code in a 2006 Nissan Altima Sedan can vary depending on the specific cause of the misfire 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 prices may vary based on location, the shop's labor rates, and the extent of the repairs needed. It's recommended to obtain quotes from multiple auto repair shops to ensure you receive a fair price for the necessary repairs.

What does this mean?

Tech Notes for P0304 2006 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 2006 Nissan Altima Sedan Code

1. What are the common symptoms of OBDII code P0304 on a 2006 Nissan Altima Sedan?

A: Common symptoms of P0304 (Number 4 Cylinder Misfire Detected) include rough idle, loss of power, engine vibrations, and potential stalling.

2. What are the possible causes of a P0304 code on a 2006 Nissan Altima Sedan?

A: The P0304 code on a 2006 Nissan Altima Sedan is often triggered by issues such as a faulty ignition coil, spark plug, fuel injector, vacuum leak, or compression problem in the number 4 cylinder.

3. How can I diagnose the cause of a cylinder 4 misfire on my 2006 Nissan Altima Sedan?

A: Diagnosing a cylinder 4 misfire involves checking the spark plug, ignition coil, fuel injector, compression, and vacuum lines for any issues. You may also need to perform a visual inspection and use a scan tool to gather more information.

4. Can driving with a P0304 code on a 2006 Nissan Altima Sedan cause further damage?

A: Continuing to drive with a P0304 code may lead to damage to the catalytic converter, increased fuel consumption, and potential damage to the engine in the long run. It's advisable to address the issue promptly.

5. How can I repair a P0304 code on my 2006 Nissan Altima Sedan?

A: To repair a P0304 code, you may need to replace the faulty ignition coil, spark plug, fuel injector, or address any other underlying issue causing the misfire in the number 4 cylinder.

6. Are there any DIY tips for fixing a cylinder 4 misfire on a 2006 Nissan Altima Sedan?

A: DIY tips for fixing a cylinder 4 misfire include checking and replacing the spark plug, inspecting the ignition coil for damage, ensuring proper fuel delivery, and checking for vacuum leaks near the cylinder.

7. How much does it typically cost to repair a P0304 code on a 2006 Nissan Altima Sedan?

A: The cost of repairing a P0304 code on a 2006 Nissan Altima Sedan can vary depending on the specific issue causing the misfire. Costs may range from around $100 for a basic repair to several hundred dollars for more complex diagnostics and parts replacement.

8. Can a P0304 code on a 2006 Nissan Altima Sedan be triggered by a loose gas cap?

A: While a loose gas cap typically triggers an evaporative emissions code, it is not a common cause of a P0304 code related to a cylinder misfire in a 2006 Nissan Altima Sedan. It's best to focus on other potential causes first.

9. Will resetting the OBDII system clear a P0304 code on a 2006 Nissan Altima Sedan?

A: Resetting the OBDII system may temporarily clear the P0304 code, but if the underlying issue causing the misfire is not addressed, the code is likely to reappear after driving the vehicle for a certain period. It's important to diagnose and fix the root cause.

10. Can a dirty air filter cause a P0304 code on a 2006 Nissan Altima Sedan?

A: While a dirty air filter can impact engine performance, it is not a common cause of a P0304 code specifically related to a cylinder misfire. Focus on components like spark plugs, ignition coils, and fuel injectors when troubleshooting this code.

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