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P0304 2010 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 2010 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 3,077
How popular is this code, among other codes? Low
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Table of contents Created and updated by William Orellana on Mar 29, 2024
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Code P0304 2010 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 2010 Nissan Pathfinder - Number 4 Cylinder Misfire Detected - AutoCodes.com
P0304 2010 Nissan Pathfinder Code - Number 4 Cylinder Misfire Detected
What does this mean?

What are the Possible Causes of the DTC P0304 2010 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 2010 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 2010 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 2010 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 2010 Nissan Pathfinder Code

1. What does the OBDII code P0304 mean in a 2010 Nissan Pathfinder?

P0304 indicates a misfire has been detected in cylinder number 4, meaning that cylinder isn’t firing properly.

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

Symptoms can include rough idling, reduced engine power, poor fuel economy, difficulty starting, or the Check Engine Light turning on.

3. What causes the P0304 code on a 2010 Nissan Pathfinder?

Common causes include a faulty spark plug, a bad ignition coil, clogged fuel injectors, vacuum leaks, or low cylinder compression in cylinder 4.

4. Can a dirty fuel injector cause the P0304 code?

Yes, a clogged or malfunctioning fuel injector can disrupt fuel delivery, leading to a misfire in cylinder 4.

5. Should I replace all the spark plugs if I get the P0304 code?

If the spark plugs are old, it’s a good idea to replace all of them to ensure consistent performance, even if only cylinder 4 is misfiring.

6. How serious is the P0304 code on a 2010 Nissan Pathfinder?

P0304 is moderately serious. Driving with a misfire can damage the catalytic converter or other engine components over time.

7. Can a bad ignition coil trigger the P0304 code?

Yes, a failing ignition coil can cause insufficient spark, leading to a misfire in cylinder 4.

8. How do I fix the P0304 code on my Nissan Pathfinder?

Inspect and replace the spark plug, ignition coil, or fuel injector for cylinder 4. Check for vacuum leaks or test cylinder compression if the issue persists.

9. What tools do I need to diagnose the P0304 code?

You’ll need an OBDII scanner, a spark plug tester, a multimeter to test ignition coils, and possibly a compression tester.

10. Can I drive my Nissan Pathfinder with a P0304 code?

While you can drive it short-term, it’s not recommended. Prolonged driving with a misfire can cause further engine damage or increase repair costs.

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