AutoCodes – Nissan – P0302 2004 Nissan Maxima

P0302 2004 Nissan Maxima Code - Number 2 Cylinder Misfire Detected

Quick Answer

When a misfire occurs, engine speed will fluctuate. Common causes include Faulty Spark Plug #2, Clogged or faulty Fuel Injector #2, Faulty Ignition Coil #2. 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: P0302 2004 Nissan Maxima indicates Number 2 Cylinder Misfire Detected.
Common causes: Common causes include Faulty Spark Plug #2, Clogged or faulty Fuel Injector #2, Faulty Ignition Coil #2.
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 8,144

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 P0302 2004 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 #2 is misfiring.

OBDII Code P0302 2004 Nissan Maxima - Number 2 Cylinder Misfire Detected - AutoCodes.com — P0302 2004 Nissan Maxima Code - Number 2 Cylinder Misfire Detected

What does this mean?

What are the Possible Causes of the DTC P0302 2004 Nissan Maxima?

Faulty Spark Plug #2
Clogged or faulty Fuel Injector #2
Faulty Ignition Coil #2
Fuel Injector #2 harness is open or shorted
Fuel Injector #2 circuit poor electrical connection
Ignition Coil #2 harness is open or shorted
Ignition Coil #2 circuit poor electrical connection
Insufficient cylinder 2 compression
Incorrect fuel pressure
Intake air leak

How to Fix the DTC P0302 2004 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 P0302 code means that cylinder #2 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 #2. 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 P0302 2004 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 P0302 2004 Nissan Maxima Code

1. What are the common symptoms of OBDII code P0302 (Number 2 Cylinder Misfire Detected) on a 2004 Nissan Maxima?

- Common symptoms include rough idling, loss of power, increased fuel consumption, and noticeable engine vibration.

2. What are the possible causes of a P0302 code on a 2004 Nissan Maxima?

- The most common causes are a faulty ignition coil, spark plug, fuel injector, vacuum leak, or low compression in the number 2 cylinder.

3. How can I diagnose the source of a misfire in the number 2 cylinder of my 2004 Nissan Maxima?

- You can use a scan tool to check for the specific cylinder misfire code, visually inspect the ignition components, perform a compression test, and check for vacuum leaks.

4. Can driving with a P0302 code on a 2004 Nissan Maxima cause further damage to the engine?

- Continuing to drive with a misfire can potentially damage the catalytic converter and other engine components due to unburned fuel entering the exhaust system.

5. What are some DIY repair tips for fixing a P0302 code on a 2004 Nissan Maxima?

- DIY repair tips include replacing the spark plug, ignition coil, or fuel injector in the number 2 cylinder, checking and repairing any vacuum leaks, and performing a compression test.

6. Is it safe to continue driving my 2004 Nissan Maxima with a P0302 misfire code?

- It is not recommended to drive with a misfire as it can lead to further damage and decreased engine performance. It's best to address the issue promptly.

7. How much does it typically cost to repair a P0302 code on a 2004 Nissan Maxima at a repair shop?

- The cost of repairs can vary depending on the exact cause of the misfire, but it can range from $100 to $500 or more, including parts and labor.

8. Can a dirty or clogged fuel injector cause a P0302 misfire code on a 2004 Nissan Maxima?

- Yes, a dirty or clogged fuel injector can disrupt the fuel delivery to the number 2 cylinder, leading to a misfire and triggering the P0302 code.

9. How often should the spark plugs be replaced in a 2004 Nissan Maxima to avoid misfire issues?

- It is recommended to replace the spark plugs every 30,000 to 50,000 miles to maintain optimal engine performance and prevent misfire issues.

10. Will resetting the OBDII code temporarily fix a P0302 misfire issue in a 2004 Nissan Maxima?

- Resetting the code may temporarily clear the check engine light, but if the underlying issue causing the misfire is not addressed, the code is likely to return.