AutoCodes – Nissan – P0303 2010 Nissan Pathfinder

P0303 2010 Nissan Pathfinder Code - Number 3 Cylinder Misfire Detected

Quick Answer

When a misfire occurs, engine speed will fluctuate. Common causes include Faulty Spark Plug #3, Clogged or faulty Fuel Injector #3, Faulty Ignition Coil #3. 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: P0303 2010 Nissan Pathfinder indicates Number 3 Cylinder Misfire Detected.
Common causes: Common causes include Faulty Spark Plug #3, Clogged or faulty Fuel Injector #3, Faulty Ignition Coil #3.
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 3,075

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 P0303 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 #3 is misfiring.

OBDII Code P0303 2010 Nissan Pathfinder - Number 3 Cylinder Misfire Detected - AutoCodes.com — P0303 2010 Nissan Pathfinder Code - Number 3 Cylinder Misfire Detected

What does this mean?

What are the Possible Causes of the DTC P0303 2010 Nissan Pathfinder?

Faulty Spark Plug #3
Clogged or faulty Fuel Injector #3
Faulty Ignition Coil #3
Fuel Injector #3 harness is open or shorted
Fuel Injector #3 circuit poor electrical connection
Ignition Coil #3 harness is open or shorted
Ignition Coil #3 circuit poor electrical connection
Insufficient cylinder 3 compression
Incorrect fuel pressure
Intake air leak

How to Fix the DTC P0303 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 P0303 code means that cylinder #3 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 #3. 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 P0303 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.

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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 P0303 2010 Nissan Pathfinder Code

1. What are the common symptoms of OBDII code P0303 in a 2010 Nissan Pathfinder?

- Common symptoms of a number 3 cylinder misfire detected include rough idling, loss of power, engine vibration, and potential stalling.

2. What are the possible causes of a number 3 cylinder misfire in a 2010 Nissan Pathfinder?

- The misfire can be caused by issues such as a faulty spark plug, ignition coil, fuel injector, vacuum leak, or low compression in the cylinder.

3. How can I diagnose the source of the misfire in the number 3 cylinder of my 2010 Nissan Pathfinder?

- To pinpoint the issue, perform a thorough inspection of the spark plugs, ignition coils, fuel injectors, and check for vacuum leaks or compression issues using a diagnostic tool.

4. Can a dirty or clogged fuel injector cause OBDII code P0303 in a 2010 Nissan Pathfinder?

- Yes, a dirty or clogged fuel injector can disrupt the fuel-air mixture in the number 3 cylinder, leading to a misfire and triggering the P0303 code.

5. Is it safe to drive my 2010 Nissan Pathfinder with OBDII code P0303 indicating a number 3 cylinder misfire?

- It is not recommended to drive the vehicle with a cylinder misfire as it can cause further damage to the engine and catalytic converter. Immediate attention and repair are advised.

6. How important is it to address OBDII code P0303 in a 2010 Nissan Pathfinder promptly?

- It is crucial to address the number 3 cylinder misfire promptly as ignoring it can lead to decreased fuel efficiency, engine damage, and potential safety hazards.

7. Can a DIY enthusiast repair OBDII code P0303 in a 2010 Nissan Pathfinder?

- Depending on the skill level, DIY enthusiasts can attempt to address the misfire by replacing spark plugs, ignition coils, or performing basic diagnostics. However, complex issues may require professional assistance.

8. Will resetting the OBDII system clear the P0303 code in a 2010 Nissan Pathfinder?

- Resetting the OBDII system may temporarily clear the code, but it will reappear if the underlying issue causing the number 3 cylinder misfire is not resolved.

9. How much can I expect to pay for a professional repair of OBDII code P0303 in a 2010 Nissan Pathfinder?

- The cost of professional repair for a number 3 cylinder misfire can vary depending on the exact cause of the issue, but it typically ranges from $100 to $500 or more, including parts and labor.

10. Can a failing ignition coil be a common culprit behind OBDII code P0303 in a 2010 Nissan Pathfinder?

- Yes, a failing ignition coil is a common culprit for a number 3 cylinder misfire detected in a 2010 Nissan Pathfinder, and replacing the faulty coil can often resolve the issue.