Engine-Codes.com
Engine-Codes – Ford – P0304 2007 Ford Fusion

P0304 2007 Ford Fusion Code - Cylinder 4 Misfire Detected

Quick Answer

The diagnostic trouble code P0304 for a 2007 Ford Fusion indicates that a misfire has been detected in cylinder 4 of the engine. Common causes include Faulty spark plug or ignition coil, Clogged fuel injector, Low fuel pressure. 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 Ford Fusion indicates Cylinder 4 Misfire Detected.
Common causes
Common causes include Faulty spark plug or ignition coil, Clogged fuel injector, Low fuel pressure.
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
💬 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 2007 Ford Fusion Description

The diagnostic trouble code P0304 for a 2007 Ford Fusion indicates that a misfire has been detected in cylinder 4 of the engine. A misfire occurs when the fuel-air mixture in the cylinder fails to ignite properly, leading to a lack of power, rough idling, and potentially causing damage to the engine over time. This issue can be caused by a variety of factors, including problems with the ignition system, fuel system, or engine mechanical components.

OBDII Code P0304 2007 Ford Fusion - Cylinder 4 Misfire Detected
P0304 2007 Ford Fusion Code - Cylinder 4 Misfire Detected

Common Causes of P0304 2007 Ford Fusion

  1. Faulty spark plug or ignition coil
  2. Clogged fuel injector
  3. Low fuel pressure
  4. Vacuum leaks
  5. Engine mechanical issues (low compression)

Symptoms of P0304 2007 Ford Fusion

  1. Loss of power
  2. Rough idle
  3. Hesitation or jerking during acceleration
  4. Increased fuel consumption
  5. Check engine light illuminated

How to Fix P0304 2007 Ford Fusion

  1. Diagnose the specific cause of the misfire by performing a comprehensive engine inspection, including checking the spark plugs, ignition coils, fuel injectors, and fuel pressure.
  2. Replace faulty spark plugs or ignition coils if necessary.
  3. Clean or replace clogged fuel injectors.
  4. Repair any vacuum leaks in the intake system.
  5. Address any engine mechanical issues, such as low compression in cylinder 4.

Cost to Fix P0304 2007 Ford Fusion

The cost estimate for repairing a cylinder 4 misfire in a 2007 Ford Fusion can vary depending on the specific cause of the issue and the cost of parts and labor. On average, the cost of repairing a misfire in one cylinder can range from $100 to $500, including parts and labor. However, it is important to note that the actual cost may be higher or lower depending on the extent of the repairs needed and the rates charged by auto repair shops in your area. It is recommended to obtain a detailed quote from a reputable auto repair shop to determine the exact cost of resolving the cylinder 4 misfire in your vehicle.

What does this mean?

Tech Notes for P0304 2007 Ford Fusion

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 2007 Ford Fusion code?

Need more information on how to fix the P0304 2007 Ford Fusion code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0304 2007 Ford Fusion 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 2007 Ford Fusion Code

1. What are the common symptoms of OBDII code P0304 (Cylinder 4 Misfire Detected) in a 2007 Ford Fusion?

- Common symptoms include engine misfiring, rough idling, loss of power, and potential decrease in fuel efficiency.

2. What are the possible causes of a Cylinder 4 misfire in a 2007 Ford Fusion triggering code P0304?

- Common causes may include faulty spark plugs, ignition coils, fuel injectors, vacuum leaks, low compression, or issues with the engine control module.

3. How can I diagnose the specific cause of the Cylinder 4 misfire in my 2007 Ford Fusion?

- Diagnosis typically involves checking spark plugs, ignition coils, fuel injectors, compression levels, vacuum lines, and conducting a thorough inspection of the ignition system.

4. Can a dirty or clogged fuel injector cause a Cylinder 4 misfire in a 2007 Ford Fusion?

- Yes, a dirty or clogged fuel injector can disrupt the fuel delivery to Cylinder 4, leading to a misfire and triggering OBDII code P0304.

5. Is it safe to continue driving my 2007 Ford Fusion with OBDII code P0304 (Cylinder 4 Misfire Detected) present?

- It is not recommended to drive the vehicle with a misfire as it can cause further damage to the engine and emission control system. Immediate diagnosis and repair are advised.

6. How can I repair a Cylinder 4 misfire in my 2007 Ford Fusion to clear OBDII code P0304?

- Repair may involve replacing spark plugs, ignition coils, fuel injectors, addressing vacuum leaks, checking compression, or repairing issues with the engine control module.

7. Can a bad ignition coil be the sole reason for a Cylinder 4 misfire in a 2007 Ford Fusion?

- Yes, a faulty ignition coil can cause a misfire in Cylinder 4, leading to the triggering of OBDII code P0304.

8. Will resetting the OBDII code P0304 in my 2007 Ford Fusion make the misfire issue disappear?

- Resetting the code may temporarily clear the warning light, but the underlying issue causing the Cylinder 4 misfire needs to be diagnosed and repaired to prevent future occurrences.

9. How important is it to address OBDII code P0304 (Cylinder 4 Misfire Detected) promptly in a 2007 Ford Fusion?

- It is crucial to address the misfire issue promptly to prevent further damage to the engine components, ensure optimal performance, and maintain fuel efficiency.

10. Can a simple tune-up resolve the Cylinder 4 misfire issue causing OBDII code P0304 in a 2007 Ford Fusion?

- A tune-up, including replacing spark plugs, can sometimes resolve a misfire issue, but if the problem persists, a more in-depth diagnosis may be necessary to identify the root cause.

Discuss the causes and fixes for P0304 2007 Ford Fusion OBDII Code

Submit a New Comment

Code P0304 2007 Ford Fusion comments

No comments found for this page.