AutoCodes – Nissan – P0303 2007 Nissan Pathfinder

P0303 2007 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 2007 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 6,373

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 2007 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 2007 Nissan Pathfinder - Number 3 Cylinder Misfire Detected - AutoCodes.com — P0303 2007 Nissan Pathfinder Code - Number 3 Cylinder Misfire Detected

What does this mean?

What are the Possible Causes of the DTC P0303 2007 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 2007 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 2007 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 P0303 2007 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 P0303 2007 Nissan Pathfinder Code

1. What are the common symptoms of OBDII code P0303 on a 2007 Nissan Pathfinder?

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

2. What are the possible causes of a number 3 cylinder misfire in a 2007 Nissan Pathfinder?

- Possible causes include faulty spark plugs, ignition coils, fuel injectors, vacuum leaks, low compression, or issues with the engine control module.

3. How can I diagnose the cause of a number 3 cylinder misfire in my 2007 Nissan Pathfinder?

- Diagnose by checking spark plugs, ignition coils, fuel injectors, vacuum leaks, compression levels, and using a scan tool to monitor live engine data.

4. Can a dirty fuel injector cause OBDII code P0303 on a 2007 Nissan Pathfinder?

- Yes, a dirty or clogged fuel injector can cause a misfire in the number 3 cylinder, triggering OBDII code P0303.

5. How can I repair a number 3 cylinder misfire in my 2007 Nissan Pathfinder?

- Repair options include replacing spark plugs, ignition coils, fuel injectors, fixing vacuum leaks, performing a compression test, or reprogramming the engine control module.

6. Is it safe to drive my 2007 Nissan Pathfinder with OBDII code P0303?

- It is not recommended to drive with a misfire as it can cause damage to the catalytic converter and other engine components. It's best to repair the issue before driving.

7. Will resetting the OBDII code P0303 on a 2007 Nissan Pathfinder make the problem go away?

- Resetting the code without addressing the underlying issue will not fix the problem. The issue causing the misfire must be diagnosed and repaired.

8. Can bad spark plugs cause a number 3 cylinder misfire on a 2007 Nissan Pathfinder?

- Yes, worn out or faulty spark plugs can lead to a misfire in the number 3 cylinder, triggering OBDII code P0303.

9. How can I prevent OBDII code P0303 from appearing again on my 2007 Nissan Pathfinder?

- Regular maintenance, such as changing spark plugs, inspecting ignition components, and addressing any engine issues promptly, can help prevent future misfires.

10. Is it necessary to visit a mechanic for OBDII code P0303 diagnosis and repair on a 2007 Nissan Pathfinder?

- While some DIY enthusiasts may be able to diagnose and repair the issue themselves, it is advisable to consult a mechanic for proper diagnosis and repair of a number 3 cylinder misfire.