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Engine-Codes – Nissan – P0304 2010 Nissan Altima Sedan

P0304 2010 Nissan Altima Sedan Code - Number 4 Cylinder Misfire Detected

Quick Answer

The diagnostic trouble code P0304 for a 2010 Nissan Altima Sedan indicates that a misfire has been detected in the number 4 cylinder of the engine. Common causes include Faulty spark plug in the number 4 cylinder, Failing ignition coil for the number 4 cylinder, Clogged fuel injector for the number 4 cylinder. 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 2010 Nissan Altima Sedan indicates Number 4 Cylinder Misfire Detected.
Common causes
Common causes include Faulty spark plug in the number 4 cylinder, Failing ignition coil for the number 4 cylinder, Clogged fuel injector for the number 4 cylinder.
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 12, 2024
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Code P0304 2010 Nissan Altima Sedan Description

The diagnostic trouble code P0304 for a 2010 Nissan Altima Sedan indicates that a misfire has been detected in the number 4 cylinder of the engine. This means that the fuel-air mixture in the cylinder is not igniting properly, leading to a loss of power, rough idling, and potentially increased emissions. A misfire can be caused by a variety of issues, including problems with the ignition system, fuel system, or engine mechanical components.

OBDII Code P0304 2010 Nissan Altima Sedan - Number 4 Cylinder Misfire Detected
P0304 2010 Nissan Altima Sedan Code - Number 4 Cylinder Misfire Detected

Common Causes of P0304 2010 Nissan Altima Sedan

  1. Faulty spark plug in the number 4 cylinder
  2. Failing ignition coil for the number 4 cylinder
  3. Clogged fuel injector for the number 4 cylinder
  4. Vacuum leak affecting the number 4 cylinder
  5. Low compression in the number 4 cylinder

Symptoms of P0304 2010 Nissan Altima Sedan

  1. Loss of power or acceleration
  2. Rough idling or shaking while the engine is running
  3. Increased fuel consumption
  4. Engine hesitation or stumbling
  5. Check Engine Light illuminated on the dashboard

How to Fix P0304 2010 Nissan Altima Sedan

  1. Diagnose the specific cause of the misfire by performing a compression test, inspecting spark plugs and ignition coils, and checking fuel injectors.
  2. Replace the faulty spark plug in the number 4 cylinder if necessary.
  3. Test and replace the ignition coil for the number 4 cylinder if it is found to be faulty.
  4. Clean or replace the fuel injector for the number 4 cylinder to ensure proper fuel delivery.
  5. Address any vacuum leaks in the intake system that may be affecting the number 4 cylinder.

Cost to Fix P0304 2010 Nissan Altima Sedan

The typical repair costs for addressing a misfire in the number 4 cylinder of a 2010 Nissan Altima Sedan can range from $100 to $500, depending on the specific cause of the issue and the cost of parts and labor. It's important to note that diagnosis time and labor rates at auto repair shops can vary, so it's advisable to check local rates for a more accurate estimate.

What does this mean?

Tech Notes for P0304 2010 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 2010 Nissan Altima Sedan Code

1. What are the common symptoms of OBDII code P0304 (Number 4 Cylinder Misfire Detected) in a 2010 Nissan Altima Sedan?

- The common symptoms include engine misfires, rough idling, loss of power, and potential engine vibrations.

2. What can cause OBDII code P0304 in a 2010 Nissan Altima Sedan?

- Possible causes of the P0304 code include faulty spark plugs, a malfunctioning ignition coil, vacuum leaks, fuel injector issues, or a problem with the engine's compression.

3. How can I diagnose the cause of OBDII code P0304 in my 2010 Nissan Altima Sedan?

- You can start by checking the spark plugs, ignition coil, and fuel injector for any signs of wear or damage. Conduct a compression test on the Number 4 cylinder and inspect for vacuum leaks.

4. Can driving with OBDII code P0304 (Number 4 Cylinder Misfire Detected) damage my 2010 Nissan Altima Sedan?

- Driving with a misfire can potentially cause damage to the catalytic converter over time. It's best to address the issue promptly to avoid further complications.

5. How can I repair OBDII code P0304 in my 2010 Nissan Altima Sedan?

- Depending on the cause, you may need to replace the spark plugs, ignition coil, fuel injector, or address any vacuum leaks. Ensure proper diagnosis before proceeding with repairs.

6. Are there any simple maintenance tips to prevent OBDII code P0304 in a 2010 Nissan Altima Sedan?

- Regularly maintaining your vehicle by following the recommended service intervals for spark plug replacements, checking ignition components, and monitoring for signs of engine issues can help prevent misfires.

7. Can a dirty air filter trigger OBDII code P0304 in a 2010 Nissan Altima Sedan?

- While a dirty air filter may not directly cause the P0304 code, it can affect engine performance and potentially lead to misfires. It's advisable to keep the air filter clean as part of routine maintenance.

8. Is it safe to drive my 2010 Nissan Altima Sedan with a flashing check engine light due to OBDII code P0304?

- A flashing check engine light indicates a severe misfire that can cause damage to the catalytic converter. It is not safe to drive the vehicle in this condition and immediate attention is required.

9. Can extreme weather conditions contribute to OBDII code P0304 in a 2010 Nissan Altima Sedan?

- Extreme weather conditions, such as very cold temperatures affecting the engine's ability to ignite fuel properly, can potentially contribute to misfires and trigger the P0304 code.

10. How much can I expect to pay for repairs related to OBDII code P0304 in a 2010 Nissan Altima Sedan?

- The cost of repairs for the P0304 code can vary depending on the exact cause of the misfire and the labor rates in your area. It's recommended to obtain a diagnosis from a trusted mechanic for an accurate estimate.

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