AutoCodes – Nissan – P0304 2012 Nissan Sentra

P0304 2012 Nissan Sentra 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 Sentra 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 10,477

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 Sentra 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 Sentra - Number 4 Cylinder Misfire Detected - AutoCodes.com — P0304 2012 Nissan Sentra Code - Number 4 Cylinder Misfire Detected

What does this mean?

What are the Possible Causes of the DTC P0304 2012 Nissan Sentra?

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 Sentra?

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 Sentra 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 2012 Nissan Sentra 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 2012 Nissan Sentra Code

1. What are the common symptoms of OBDII code P0304 (Number 4 Cylinder Misfire Detected) in a 2012 Nissan Sentra?

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

2. What are the possible causes of a P0304 code in a 2012 Nissan Sentra?

- The code P0304 can be triggered by issues such as a faulty spark plug, ignition coil, fuel injector, vacuum leak, or a problem with the cylinder compression.

3. How can I diagnose the specific cause of the Number 4 cylinder misfire in my 2012 Nissan Sentra?

- Diagnostic steps may involve checking the spark plug and ignition coil for damage, testing the fuel injector, inspecting for vacuum leaks, and performing a compression test on the cylinder.

4. Is it safe to continue driving my 2012 Nissan Sentra with a P0304 code?

- It is not recommended to drive the vehicle with a misfire as it can lead to further damage to the engine components. It's best to address the issue promptly.

5. What repair tips can help fix the Number 4 cylinder misfire in a 2012 Nissan Sentra?

- Repair tips may include replacing the spark plug, ignition coil, or fuel injector of the Number 4 cylinder, fixing any vacuum leaks, and addressing any compression issues.

6. Can a dirty or clogged fuel injector cause a P0304 code in a 2012 Nissan Sentra?

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

7. How important is it to address a P0304 code promptly in a 2012 Nissan Sentra?

- It is crucial to address a P0304 code promptly to prevent potential damage to the engine, ensure optimal performance, and maintain fuel efficiency.

8. Can weather conditions affect the occurrence of a P0304 code in a 2012 Nissan Sentra?

- Extreme weather conditions like cold temperatures or humidity can sometimes exacerbate existing issues that lead to a misfire and trigger the P0304 code.

9. Is resetting the OBDII system after addressing a P0304 code in a 2012 Nissan Sentra necessary?

- It is recommended to reset the OBDII system after fixing the underlying issue causing the misfire to ensure the code doesn't reappear and to verify that the repair was successful.

10. How can regular maintenance help prevent a P0304 code in a 2012 Nissan Sentra?

- Regular maintenance, including periodic spark plug replacements, ignition system checks, and fuel system cleaning, can help prevent issues that may lead to a P0304 misfire code.