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P0301 Nissan Code - Number 1 Cylinder Misfire Detected

Quick Answer

When a misfire occurs, engine speed will fluctuate. Common causes include Faulty Spark Plug #1, Clogged or faulty Fuel Injector #1, Faulty Ignition Coil #1. 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
P0301 Nissan indicates Number 1 Cylinder Misfire Detected.
Common causes
Common causes include Faulty Spark Plug #1, Clogged or faulty Fuel Injector #1, Faulty Ignition Coil #1.
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 110,997
How popular is this code, among other codes? Medium
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Table of contents Created and updated by William Orellana on Jul 21, 2022
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Code P0301 Nissan 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 #1 is misfiring.
OBDII Code P0301 Nissan - Number 1 Cylinder Misfire Detected - AutoCodes.com
P0301 Nissan Code - Number 1 Cylinder Misfire Detected
What does this mean?

What are the Possible Causes of the DTC P0301 Nissan?

  • Faulty Spark Plug #1
  • Clogged or faulty Fuel Injector #1
  • Faulty Ignition Coil #1
  • Fuel Injector #1 harness is open or shorted
  • Fuel Injector #1 circuit poor electrical connection
  • Ignition Coil #1 harness is open or shorted
  • Ignition Coil #1 circuit poor electrical connection
  • Insufficient cylinder 1 compression
  • Incorrect fuel pressure
  • Intake air leak

How to Fix the DTC P0301 Nissan?

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 P0301 code means that cylinder #1 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 #1. If the problem persists more tests need to be done to diagnose the problem. See "Possible Causes" for the most common problems.





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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0301 Nissan 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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Information for Specific Nissan Models

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 P0301 Nissan Code

1. What are the common symptoms of OBDII code P0301 in a Nissan vehicle?

A misfire in the number 1 cylinder can cause symptoms like rough idle, loss of power, engine shaking, and increased fuel consumption.

2. What are the possible causes of a number 1 cylinder misfire in a Nissan, triggering code P0301?

Potential causes include faulty spark plugs, a failing ignition coil, clogged fuel injectors, vacuum leaks, or low compression in the number 1 cylinder.

3. How can I diagnose the specific cause of OBDII code P0301 in my Nissan?

To pinpoint the issue, you can perform tests like checking spark plugs and ignition coils, inspecting fuel injectors, conducting a compression test, and scanning for any other related trouble codes.

4. Can a dirty or clogged fuel injector lead to a number 1 cylinder misfire in a Nissan?

Yes, a dirty or clogged fuel injector can disrupt the air-fuel mixture in the number 1 cylinder, causing a misfire and triggering OBDII code P0301.

5. Are there any DIY repair tips for addressing OBDII code P0301 in a Nissan?

DIY repair tips include replacing spark plugs, inspecting and cleaning fuel injectors, testing ignition coils, checking for vacuum leaks, and ensuring proper cylinder compression.

6. Is it safe to continue driving my Nissan with OBDII code P0301 indicating a number 1 cylinder misfire?

Continuing to drive with a misfire can potentially damage the catalytic converter and other engine components. It is recommended to address the issue promptly to avoid further damage.

7. Can weather conditions affect the occurrence of a number 1 cylinder misfire in a Nissan triggering code P0301?

Extreme weather conditions such as very cold temperatures or heavy rain can sometimes exacerbate existing issues leading to a misfire, but the root cause is usually related to mechanical components.

8. How often should spark plugs be replaced to prevent OBDII code P0301 in a Nissan?

Spark plugs should typically be replaced every 30,000 to 100,000 miles, depending on the type of plugs used and the manufacturer's recommendations, to maintain optimal engine performance and prevent misfires.

9. Will resetting the OBDII code P0301 in my Nissan make the issue go away permanently?

Resetting the code without addressing the underlying problem will not fix the misfire issue causing OBDII code P0301. It is crucial to diagnose and repair the root cause to prevent the code from reappearing.

10. Can a failing oxygen sensor contribute to the occurrence of OBDII code P0301 in a Nissan?

While a failing oxygen sensor is not a direct cause of a number 1 cylinder misfire, it can lead to an imbalanced air-fuel mixture that may exacerbate the misfire issue, potentially triggering code P0301.

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