AutoCodes – Nissan – P0304 2005 Nissan Maxima

P0304 2005 Nissan Maxima 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 2005 Nissan Maxima 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 5,582

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 2005 Nissan Maxima 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 2005 Nissan Maxima - Number 4 Cylinder Misfire Detected - AutoCodes.com — P0304 2005 Nissan Maxima Code - Number 4 Cylinder Misfire Detected

What does this mean?

What are the Possible Causes of the DTC P0304 2005 Nissan Maxima?

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 2005 Nissan Maxima?

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 2005 Nissan Maxima 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.

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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 2005 Nissan Maxima Code

1. What are common symptoms of OBDII code P0304 on a 2005 Nissan Maxima?

- Common symptoms include rough idling, loss of power, engine vibration, and a noticeable decrease in fuel efficiency.

2. What can cause a Number 4 cylinder misfire in a 2005 Nissan Maxima?

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

3. How can I diagnose the source of the misfire on the Number 4 cylinder of my 2005 Nissan Maxima?

- Diagnose the issue by checking the spark plug and ignition coil for signs of wear or damage, inspecting for vacuum leaks, and performing a compression test on the cylinder.

4. Can a dirty fuel injector cause a P0304 code on a 2005 Nissan Maxima?

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

5. What is the recommended repair for a Number 4 cylinder misfire on a 2005 Nissan Maxima?

- The recommended repair may involve replacing the spark plugs, ignition coil, fuel injector, or addressing any vacuum leaks to resolve the misfire issue.

6. Can driving with a P0304 code on a 2005 Nissan Maxima cause further damage to the engine?

- Continuing to drive with a misfire can potentially cause damage to the catalytic converter and other engine components, leading to more costly repairs down the line.

7. How can I reset the OBDII code P0304 on my 2005 Nissan Maxima after making repairs?

- You can reset the code using an OBDII scanner or by disconnecting the car's battery for a few minutes to clear the error code from the system.

8. Are there any preventive maintenance tips to avoid a Number 4 cylinder misfire in a 2005 Nissan Maxima?

- Regularly scheduled maintenance, such as changing spark plugs and inspecting ignition components, can help prevent misfire issues and keep the engine running smoothly.

9. Is it safe to drive my 2005 Nissan Maxima with a flashing check engine light due to a P0304 code?

- A flashing check engine light indicates a severe misfire that can cause damage to the catalytic converter. It is recommended to avoid driving the vehicle and address the issue promptly.

10. How long does it take to repair a Number 4 cylinder misfire on a 2005 Nissan Maxima?

- The repair time can vary depending on the exact cause of the misfire, but it may take anywhere from a few hours to a full day to diagnose and fix the issue properly.