AutoCodes – Nissan – P0303 2007 Nissan Maxima

P0303 2007 Nissan Maxima 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 Maxima 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 7,864

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

What does this mean?

What are the Possible Causes of the DTC P0303 2007 Nissan Maxima?

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 Maxima?

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 Maxima 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 2007 Nissan Maxima Code

1. What are the common symptoms of OBDII code P0303 in a 2007 Nissan Maxima?

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

2. What are the possible causes of a P0303 code in a 2007 Nissan Maxima?

- The code P0303 in a 2007 Nissan Maxima can be triggered by issues such as a faulty ignition coil, spark plug, fuel injector, vacuum leak, or low compression in the number 3 cylinder.

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

- To diagnose the cause of the misfire, you can perform a visual inspection of the ignition system components, test the ignition coil, spark plug, and fuel injector, and conduct a compression test on the number 3 cylinder.

4. Can a dirty or clogged fuel injector cause a P0303 code in a 2007 Nissan Maxima?

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

5. How can I repair a P0303 code in my 2007 Nissan Maxima?

- Depending on the underlying cause, possible repairs for a P0303 code may include replacing the faulty ignition coil, spark plug, fuel injector, addressing vacuum leaks, or performing a cylinder compression test and subsequent repairs if needed.

6. Is it safe to continue driving my 2007 Nissan Maxima with a P0303 code?

- It is not recommended to drive your vehicle with a P0303 code as it can lead to further damage to the engine and catalytic converter. It is advised to address the issue promptly.

7. Can a bad spark plug wire cause a number 3 cylinder misfire in a 2007 Nissan Maxima?

- Yes, a bad or damaged spark plug wire can cause a misfire in the number 3 cylinder, leading to the P0303 code.

8. How much does it cost to repair a P0303 code in a 2007 Nissan Maxima?

- The cost of repairing a P0303 code in a 2007 Nissan Maxima can vary depending on the exact cause of the misfire and the parts and labor involved. It is recommended to consult a professional mechanic for an accurate estimate.

9. Will resetting the OBDII code make the P0303 issue go away in a 2007 Nissan Maxima?

- Resetting the OBDII code may temporarily clear the error code, but it will not fix the underlying issue causing the misfire in the number 3 cylinder. It is important to diagnose and repair the root cause of the problem.

10. Can a malfunctioning engine control module (ECM) trigger a P0303 code in a 2007 Nissan Maxima?

- While rare, a malfunctioning ECM can potentially cause a misfire in the number 3 cylinder, leading to the P0303 code. It is recommended to rule out other common causes before considering ECM replacement.