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Engine-Codes – Nissan – P0304 2007 Nissan Sentra

P0304 2007 Nissan Sentra Code - Number 4 Cylinder Misfire Detected

Quick Answer

When a vehicle's onboard diagnostic system detects a misfire in the number 4 cylinder, indicated by the P0304 trouble code, it means that the engine's cylinder number 4 is not functioning properly. Common causes include Faulty spark plug or ignition coil, Clogged or malfunctioning fuel injector, 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 2007 Nissan Sentra indicates Number 4 Cylinder Misfire Detected.
Common causes
Common causes include Faulty spark plug or ignition coil, Clogged or malfunctioning fuel injector, 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 12, 2024
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Code P0304 2007 Nissan Sentra Description

When a vehicle's onboard diagnostic system detects a misfire in the number 4 cylinder, indicated by the P0304 trouble code, it means that the engine's cylinder number 4 is not functioning properly. This misfire can lead to a variety of issues that can impact the vehicle's performance, fuel efficiency, and emissions output.

OBDII Code P0304 2007 Nissan Sentra - Number 4 Cylinder Misfire Detected
P0304 2007 Nissan Sentra Code - Number 4 Cylinder Misfire Detected

Common Causes of P0304 2007 Nissan Sentra

  1. Faulty spark plug or ignition coil
  2. Clogged or malfunctioning fuel injector
  3. Vacuum leaks in the intake manifold
  4. Low compression in the number 4 cylinder
  5. Ignition system issues such as faulty wiring or connectors

Symptoms of P0304 2007 Nissan Sentra

  1. Rough idling or vibrations while driving
  2. Loss of power or acceleration
  3. Engine misfiring or hesitation
  4. Increased fuel consumption
  5. Check Engine Light illuminated

How to Fix P0304 2007 Nissan Sentra

  1. Diagnose the specific cause of the misfire by using a scan tool to identify the cylinder number and inspecting the spark plugs, ignition coils, and fuel injectors.
  2. Replace the faulty spark plug, ignition coil, or fuel injector in the number 4 cylinder.
  3. Check and repair any vacuum leaks in the intake manifold.
  4. Perform a compression test on the number 4 cylinder to check for low compression and address any issues found.
  5. Clear the trouble code and test drive the vehicle to ensure the misfire has been resolved.

Cost to Fix P0304 2007 Nissan Sentra

The cost of repairing a P0304 code on a 2007 Nissan Sentra can vary depending on the specific cause of the misfire and the cost of parts and labor. On average, the cost of replacing a spark plug, ignition coil, or fuel injector can range from $100 to $300 per part, excluding labor costs. The total repair cost including parts and labor could range from $150 to $500 or more. It's important to note that labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate.

What does this mean?

Tech Notes for P0304 2007 Nissan Sentra

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 2007 Nissan Sentra Code

1. What are the common symptoms of a P0304 code on a 2007 Nissan Sentra?

Misfiring, rough idling, loss of power, and potential engine vibrations are common symptoms associated with a P0304 code indicating a misfire in the number 4 cylinder.

2. What are the possible causes of a P0304 code on a 2007 Nissan Sentra?

Potential causes of a P0304 code on a 2007 Nissan Sentra include faulty spark plugs, ignition coils, fuel injectors, vacuum leaks, or problems with the engine's compression.

3. How can I diagnose the root cause of a P0304 code on my 2007 Nissan Sentra?

To diagnose the cause of a P0304 code, you can perform a thorough inspection of the spark plugs, ignition coils, fuel injectors, and vacuum lines. Additionally, a compression test can help identify any engine issues.

4. Is it safe to drive my 2007 Nissan Sentra with a P0304 code?

It is not recommended to drive your 2007 Nissan Sentra with a P0304 code as it can lead to further damage to the engine and catalytic converter. It is best to address the issue promptly.

5. How can I repair a P0304 code on my 2007 Nissan Sentra?

Repairing a P0304 code on a 2007 Nissan Sentra typically involves replacing faulty spark plugs, ignition coils, or fuel injectors. Addressing any vacuum leaks and conducting a compression test may also be necessary.

6. Can a dirty fuel injector cause a P0304 code on a 2007 Nissan Sentra?

Yes, a dirty or clogged fuel injector can disrupt the fuel mixture in the number 4 cylinder, leading to a misfire and triggering a P0304 code on a 2007 Nissan Sentra.

7. Will a P0304 code clear on its own in a 2007 Nissan Sentra?

A P0304 code is unlikely to clear on its own in a 2007 Nissan Sentra. It is important to diagnose and address the underlying issue causing the misfire to prevent further complications.

8. How much does it cost to fix a P0304 code on a 2007 Nissan Sentra?

The cost of fixing a P0304 code on a 2007 Nissan Sentra can vary depending on the specific cause of the misfire and the parts and labor involved. It is recommended to consult a professional mechanic for an accurate estimate.

9. Can a bad ignition coil cause a P0304 code on a 2007 Nissan Sentra?

Yes, a faulty ignition coil in the number 4 cylinder can lead to a weak or inconsistent spark, resulting in a misfire and triggering a P0304 code on a 2007 Nissan Sentra.

10. How often should I replace spark plugs in a 2007 Nissan Sentra to prevent a P0304 code?

It is generally recommended to replace spark plugs every 30,000 to 60,000 miles in a 2007 Nissan Sentra to maintain optimal engine performance and prevent issues like a P0304 misfire code.

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