AutoCodes – Nissan – P0304 2012 Nissan Altima Sedan

P0304 2012 Nissan Altima Sedan 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 2012 Nissan Altima Sedan 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 17,223

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 Aug 09, 2022

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0304 2012 Nissan Altima Sedan 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 2012 Nissan Altima Sedan - Number 4 Cylinder Misfire Detected - AutoCodes.com — P0304 2012 Nissan Altima Sedan Code - Number 4 Cylinder Misfire Detected

What does this mean?

What are the Possible Causes of the DTC P0304 2012 Nissan Altima Sedan?

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 2012 Nissan Altima Sedan?

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 2012 Nissan Altima Sedan 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 2012 Nissan Altima Sedan Code

1. What are the common symptoms of an OBDII code P0304 on a 2012 Nissan Altima Sedan?

- Common symptoms include engine misfires, rough idling, loss of power, and potential engine vibration.

2. What are the possible causes of a number 4 cylinder misfire detected in a 2012 Nissan Altima Sedan?

- Possible causes can include faulty spark plugs, ignition coils, fuel injectors, vacuum leaks, or issues with the engine's compression.

3. How can I diagnose the source of the number 4 cylinder misfire in my 2012 Nissan Altima Sedan?

- Diagnose by checking spark plugs, ignition coils, fuel injectors, vacuum leaks, compression levels, and performing a scan tool analysis.

4. Can driving with a P0304 OBDII code in a 2012 Nissan Altima Sedan cause further damage?

- Continuing to drive with this code may lead to further damage to the engine, catalytic converter, or other components if left unresolved.

5. What are some basic repair tips for addressing a number 4 cylinder misfire in a 2012 Nissan Altima Sedan?

- Start with checking and replacing spark plugs, inspecting ignition coils, cleaning or replacing fuel injectors, and ensuring proper engine compression.

6. Is it safe to continue driving my 2012 Nissan Altima Sedan with a P0304 code if the car seems to be running fine?

- It is not recommended to drive with a misfire code as it can lead to potential damage and may affect the vehicle's performance over time.

7. How much does it typically cost to repair a number 4 cylinder misfire detected in a 2012 Nissan Altima Sedan?

- The cost can vary depending on the exact cause, but it may range from $100 to $500 or more for parts and labor.

8. Can a DIY enthusiast fix a P0304 code on a 2012 Nissan Altima Sedan, or is it better to seek professional help?

- DIY enthusiasts with knowledge of automotive repair can attempt to fix the issue, but if unsure, it's recommended to seek professional help for accurate diagnosis and repair.

9. Will resetting the OBDII code P0304 in a 2012 Nissan Altima Sedan make the problem go away?

- Simply resetting the code without addressing the underlying issue will not fix the problem; it's crucial to diagnose and repair the root cause of the misfire.

10. How long can I safely drive my 2012 Nissan Altima Sedan with a persistent P0304 code before getting it repaired?

- It's best to address the issue promptly to prevent potential damage; avoid driving long distances or under heavy load with a misfire to prevent further complications.