AutoCodes – Nissan – P0303 2006 Nissan Pathfinder

P0303 2006 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 2006 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 6,263

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 2006 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 2006 Nissan Pathfinder - Number 3 Cylinder Misfire Detected - AutoCodes.com — P0303 2006 Nissan Pathfinder Code - Number 3 Cylinder Misfire Detected

What does this mean?

What are the Possible Causes of the DTC P0303 2006 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 2006 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 2006 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 2006 Nissan Pathfinder Code

What does the OBDII code P0303 mean on a 2006 Nissan Pathfinder?

P0303 indicates that the engine control module (ECM) has detected a misfire specifically in cylinder number 3.

What are common symptoms of a P0303 code in a 2006 Nissan Pathfinder?

Symptoms include rough idling, reduced engine performance, poor fuel economy, engine hesitation, and possibly the check engine light illuminating.

What causes a P0303 code on a 2006 Nissan Pathfinder?

Common causes include a faulty spark plug, a bad ignition coil, a clogged fuel injector, low compression in cylinder 3, or a vacuum leak near that cylinder.

Can a P0303 code damage my engine if ignored?

Yes, prolonged misfires can damage the catalytic converter, reduce engine efficiency, and potentially lead to more costly repairs.

How do I diagnose a P0303 code on my 2006 Nissan Pathfinder?

Inspect the spark plug, ignition coil, and fuel injector for cylinder 3. Perform a compression test and check for vacuum leaks or wiring issues near the affected cylinder.

Should I replace the spark plug if I get a P0303 code?

Replacing the spark plug is a good first step, as worn or fouled plugs are a common cause of misfires. If the code persists, further diagnosis is needed.

Can a clogged fuel injector cause a P0303 code?

Yes, a clogged or malfunctioning fuel injector can prevent proper fuel delivery to cylinder 3, causing a misfire.

What tools are needed to fix a P0303 code on a 2006 Nissan Pathfinder?

You'll need an OBDII scanner, spark plug socket, multimeter, and potentially a fuel injector cleaner or compression tester, depending on the issue.

Is P0303 a serious issue that needs immediate attention?

Yes, a misfire should be addressed promptly to avoid further engine damage or reduced fuel efficiency.

How much does it cost to fix a P0303 code on a 2006 Nissan Pathfinder?

Costs vary depending on the cause. Replacing a spark plug or ignition coil can cost $50-$200, while fuel injector repairs or engine work can cost significantly more.