AutoCodes – Nissan – P0304 2007 Nissan Maxima

P0304 2007 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 2007 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 6,565

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

What does this mean?

What are the Possible Causes of the DTC P0304 2007 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 2007 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 2007 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 2007 Nissan Maxima Code

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

- Common symptoms include engine misfires, rough idling, loss of power, and increased fuel consumption.

2. What can cause a number 4 cylinder misfire in a 2007 Nissan Maxima?

- The misfire can be caused by issues such as faulty spark plugs, ignition coils, fuel injectors, vacuum leaks, or a malfunctioning fuel system.

3. How can I diagnose a number 4 cylinder misfire in my 2007 Nissan Maxima?

- You can diagnose the issue by performing a visual inspection of spark plugs, checking ignition coils, testing fuel injectors, and scanning the OBDII system for trouble codes.

4. Can driving with a P0304 OBDII code harm my 2007 Nissan Maxima?

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

5. How should I repair a number 4 cylinder misfire on a 2007 Nissan Maxima?

- Depending on the root cause, repairs may involve replacing spark plugs, ignition coils, fuel injectors, or addressing vacuum leaks. It's recommended to address the issue promptly to prevent further damage.

6. Are there any DIY tips for fixing a P0304 code on a 2007 Nissan Maxima?

- DIY tips may include checking and replacing spark plugs, inspecting ignition coils for damage, cleaning fuel injectors, and ensuring there are no vacuum leaks in the system.

7. Should I reset the OBDII code after fixing a number 4 cylinder misfire on my 2007 Nissan Maxima?

- Yes, it's recommended to clear the code after fixing the issue. This will allow you to monitor if the problem reoccurs and ensure that the repair was successful.

8. Can bad gasoline quality cause a P0304 code in a 2007 Nissan Maxima?

- Poor quality gasoline or contaminated fuel can potentially cause misfires, including a P0304 code. It's advisable to use high-quality fuel from reputable sources.

9. Is it safe to drive my 2007 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's best to avoid driving the vehicle and have it towed to a repair facility for diagnosis and repairs.

10. How often should I perform regular maintenance to prevent a number 4 cylinder misfire in my 2007 Nissan Maxima?

- Regular maintenance, including timely spark plug changes, checking ignition components, and monitoring fuel system health, can help prevent issues like a number 4 cylinder misfire. It's recommended to follow the manufacturer's maintenance schedule.