AutoCodes – Nissan – P0304 2007 Nissan Pathfinder

P0304 2007 Nissan Pathfinder Code - Number 4 Cylinder Misfire Detected

Quick Answer

When a misfire occurs, engine speed will fluctuate. Common causes include Faulty Spark Plug #4, Clogged or faulty Fuel Injector #4, Faulty Ignition Coil #4. 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 Pathfinder indicates Number 4 Cylinder Misfire Detected.
Common causes: Common causes include Faulty Spark Plug #4, Clogged or faulty Fuel Injector #4, Faulty Ignition Coil #4.
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.

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Code Popularity 6,008

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 29, 2024

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0304 2007 Nissan Pathfinder Description

When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the Crankshaft Position (CKP) sensor signal to vary, the Engine Control Module (ECM) can determine that a misfire is occurring. The Diagnostic Trouble Code (DTC) will be set when the Engine Control Module monitors the crankshaft speed and has detected that engine cylinder #4 is misfiring.

OBDII Code P0304 2007 Nissan Pathfinder - Number 4 Cylinder Misfire Detected - AutoCodes.com — P0304 2007 Nissan Pathfinder Code - Number 4 Cylinder Misfire Detected

What does this mean?

What are the Possible Causes of the DTC P0304 2007 Nissan Pathfinder?

Faulty Spark Plug #4
Clogged or faulty Fuel Injector #4
Faulty Ignition Coil #4
Fuel Injector #4 harness is open or shorted
Fuel Injector #4 circuit poor electrical connection
Ignition Coil #4 harness is open or shorted
Ignition Coil #4 circuit poor electrical connection
Insufficient cylinder 4 compression
Incorrect fuel pressure
Intake air leak

How to Fix the DTC P0304 2007 Nissan Pathfinder?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0304 2007 Nissan Pathfinder code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0304 2007 Nissan Pathfinder code?

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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 Pathfinder Code

1. What does the OBDII code P0304 mean on a 2007 Nissan Pathfinder?

P0304 indicates a misfire has been detected in cylinder number 4 of the engine.

2. What are the common symptoms of a P0304 code?

Symptoms include a rough idle, reduced engine performance, poor fuel economy, hesitation during acceleration, and the check engine light being illuminated.

3. What causes a P0304 code in a 2007 Nissan Pathfinder?

Common causes include a faulty spark plug, a bad ignition coil, a clogged fuel injector, low engine compression, or a vacuum leak near cylinder 4.

4. Can I still drive my 2007 Nissan Pathfinder with a P0304 code?

Driving with a P0304 code is not recommended as it can cause further engine damage, such as overheating the catalytic converter or damaging internal components.

5. How do I diagnose a P0304 code on my 2007 Nissan Pathfinder?

Start by inspecting the spark plug, ignition coil, and fuel injector for cylinder 4. Check for vacuum leaks, low compression, or wiring issues related to the ignition system.

6. How can I fix a P0304 code in a 2007 Nissan Pathfinder?

Repairs may include replacing the spark plug, ignition coil, or fuel injector for cylinder 4, fixing vacuum leaks, or addressing low compression if necessary.

7. How much does it cost to repair a P0304 code on a 2007 Nissan Pathfinder?

The cost varies depending on the issue. Replacing a spark plug or ignition coil might cost $50â€“$200, while more complex issues like low compression could cost significantly more.

8. Can a dirty fuel injector cause a P0304 code?

Yes, a clogged or malfunctioning fuel injector can prevent proper fuel delivery to cylinder 4, causing a misfire.

9. Will a bad ignition coil trigger the P0304 code?

Yes, a failing ignition coil can prevent cylinder 4 from firing properly, leading to a misfire and triggering the code.

10. What tools do I need to troubleshoot a P0304 code?

Youâ€™ll need a diagnostic scanner, a spark plug socket, a multimeter for testing electrical components, and possibly a compression tester to check cylinder pressure.