AutoCodes – Nissan – P0303 2008 Nissan Maxima

P0303 2008 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 2008 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 5,364

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 2008 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 2008 Nissan Maxima - Number 3 Cylinder Misfire Detected - AutoCodes.com — P0303 2008 Nissan Maxima Code - Number 3 Cylinder Misfire Detected

What does this mean?

What are the Possible Causes of the DTC P0303 2008 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 2008 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 2008 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 2008 Nissan Maxima Code

1. What are the common symptoms of OBDII code P0303 in a 2008 Nissan Maxima?

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

2. What are the possible causes of a P0303 code in a 2008 Nissan Maxima?

- The most common causes of a P0303 code are faulty spark plugs, ignition coils, fuel injectors, or a vacuum leak in the intake system.

3. How can I diagnose a number 3 cylinder misfire in my 2008 Nissan Maxima?

- Diagnosing a P0303 code usually involves checking the spark plugs, ignition coils, fuel injectors, and performing a compression test on the engine.

4. Can driving with a P0303 code damage my 2008 Nissan Maxima?

- Continuing to drive with a number 3 cylinder misfire can potentially cause damage to the catalytic converter and other engine components due to unburned fuel.

5. How can I repair a P0303 code in my 2008 Nissan Maxima?

- Repairing a P0303 code involves replacing faulty spark plugs, ignition coils, or fuel injectors, as well as addressing any vacuum leaks in the intake system.

6. Are there any DIY tips for fixing a number 3 cylinder misfire in a 2008 Nissan Maxima?

- DIY tips for fixing a P0303 code include checking and replacing spark plugs and ignition coils, as well as inspecting for any visible vacuum leaks.

7. What is the typical cost of repairing a P0303 code in a 2008 Nissan Maxima?

- The cost of repairing a number 3 cylinder misfire can vary depending on the exact cause, but it may range from $100 to $500 or more for parts and labor.

8. Can a dirty air filter trigger a P0303 code in a 2008 Nissan Maxima?

- While a dirty air filter is not a direct cause of a number 3 cylinder misfire, it can contribute to poor engine performance and should be replaced regularly.

9. Will resetting the OBDII code make the P0303 error go away in a 2008 Nissan Maxima?

- Resetting the OBDII code may temporarily clear the error, but if the underlying issue causing the P0303 code is not addressed, it is likely to return.

10. Is it safe to drive my 2008 Nissan Maxima with a flashing check engine light due to a P0303 code?

- A flashing check engine light indicates a severe misfire that can cause damage to the catalytic converter. It is not safe to drive the vehicle in this condition and should be addressed immediately.