Engine-Codes.com
Engine-Codes – Nissan – P0302 2004 Nissan Altima Sedan

P0302 2004 Nissan Altima Sedan Code - Number 2 Cylinder Misfire Detected

Quick Answer

When a diagnostic trouble code P0302 is triggered in a 2004 Nissan Altima Sedan, it indicates that a misfire has been detected in the number 2 cylinder of the engine. Common causes include Faulty ignition system components such as spark plugs, ignition coils, or spark plug wires, Fuel delivery issues, such as a clogged fuel injector or a failing fuel pump, Engine mechanical problems, such as low compression in the number 2 cylinder. 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 Altima Sedan indicates Number 2 Cylinder Misfire Detected.
Common causes
Common causes include Faulty ignition system components such as spark plugs, ignition coils, or spark plug wires, Fuel delivery issues, such as a clogged fuel injector or a failing fuel pump, Engine mechanical problems, such as low compression in the number 2 cylinder.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 13, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P0302 2004 Nissan Altima Sedan Description

When a diagnostic trouble code P0302 is triggered in a 2004 Nissan Altima Sedan, it indicates that a misfire has been detected in the number 2 cylinder of the engine. This means that the fuel-air mixture in the cylinder is not igniting properly, leading to a loss of power, rough idling, and potential damage to the catalytic converter over time. The misfire can be caused by a variety of issues, including problems with the ignition system, fuel system, or engine mechanical components.

OBDII Code P0302 2004 Nissan Altima Sedan - Number 2 Cylinder Misfire Detected
P0302 2004 Nissan Altima Sedan Code - Number 2 Cylinder Misfire Detected

Common Causes of P0302 2004 Nissan Altima Sedan

  1. Faulty ignition system components such as spark plugs, ignition coils, or spark plug wires.
  2. Fuel delivery issues, such as a clogged fuel injector or a failing fuel pump.
  3. Engine mechanical problems, such as low compression in the number 2 cylinder.
  4. Vacuum leaks in the intake manifold or vacuum hoses.
  5. Issues with the engine control module (ECM) or wiring harness.

Symptoms of P0302 2004 Nissan Altima Sedan

  1. Rough idling: The vehicle may shake or vibrate while idling, indicating a misfire in the number 2 cylinder.
  2. Loss of power: The engine may feel sluggish and have reduced acceleration due to the misfire.
  3. Engine misfiring: The engine may sound rough or uneven while running, especially under load.
  4. Increased fuel consumption: A misfiring cylinder can lead to inefficient combustion, resulting in higher fuel consumption.
  5. Check Engine Light: The Check Engine Light may illuminate on the dashboard to indicate a problem with the engine.

How to Fix P0302 2004 Nissan Altima Sedan

  1. Diagnose the specific cause of the misfire by performing a compression test, checking ignition components, and inspecting the fuel system.
  2. Replace faulty spark plugs, ignition coils, or spark plug wires in the number 2 cylinder.
  3. Clean or replace clogged fuel injectors and ensure proper fuel delivery to the cylinder.
  4. Repair any vacuum leaks in the intake manifold or hoses.
  5. Reset the Check Engine Light and test drive the vehicle to ensure the misfire has been resolved.

Cost to Fix P0302 2004 Nissan Altima Sedan

The cost of repairing a P0302 code in a 2004 Nissan Altima Sedan can vary depending on the specific cause of the misfire. On average, the cost of parts such as spark plugs, ignition coils, or fuel injectors can range from $100 to $300. Labor costs at auto repair shops typically range from $80 to $150 per hour, with the total repair bill potentially amounting to $200 to $500 or more. It's recommended to consult with a mechanic for a more accurate estimate based on the specific diagnosis and repair needed for your vehicle.

What does this mean?

Tech Notes for P0302 2004 Nissan Altima Sedan

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.

Need more information about the P0302 2004 Nissan Altima Sedan code?

Need more information on how to fix the P0302 2004 Nissan Altima Sedan code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0302 2004 Nissan Altima Sedan code diagnosed by a professional: Find a repair shop in your area

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 Altima Sedan Code

1. What are common symptoms of OBDII code P0302 (Number 2 Cylinder Misfire Detected) in a 2004 Nissan Altima Sedan?

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

2. What are the possible causes of a number 2 cylinder misfire in a 2004 Nissan Altima Sedan?

- Potential causes include faulty spark plugs, ignition coils, fuel injectors, vacuum leaks, low compression, or issues with the engine's timing.

3. How can I diagnose the specific cause of a number 2 cylinder misfire in my 2004 Nissan Altima Sedan?

- Diagnose by checking spark plugs, ignition coils, fuel injectors, vacuum leaks, compression levels, and inspecting the timing components for wear or damage.

4. Can driving with a number 2 cylinder misfire OBDII code P0302 damage the engine of a 2004 Nissan Altima Sedan?

- Driving with a misfire can cause damage over time, potentially leading to catalytic converter damage, reduced engine performance, and increased emissions.

5. What are some basic repair tips for addressing a number 2 cylinder misfire in a 2004 Nissan Altima Sedan?

- Start by checking and replacing spark plugs, inspecting ignition coils, cleaning or replacing fuel injectors, and ensuring proper engine timing.

6. How much does it typically cost to repair an OBDII code P0302 (Number 2 Cylinder Misfire Detected) in a 2004 Nissan Altima Sedan?

- The cost of repairs can vary depending on the exact cause of the misfire, but it may range from a few hundred dollars to over a thousand dollars for more extensive repairs.

7. Can a DIY enthusiast fix an OBDII code P0302 (Number 2 Cylinder Misfire Detected) in a 2004 Nissan Altima Sedan?

- Depending on the skill level and tools available, some DIY enthusiasts may be able to address the issue by replacing spark plugs, ignition coils, or performing basic diagnostics.

8. Is it safe to continue driving a 2004 Nissan Altima Sedan with an active number 2 cylinder misfire OBDII code P0302?

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

9. How long does it typically take to repair an OBDII code P0302 (Number 2 Cylinder Misfire Detected) in a 2004 Nissan Altima Sedan?

- The repair time can vary based on the specific cause of the misfire, but it may take anywhere from a few hours to a full day in more complex cases.

10. Will resetting the OBDII code P0302 (Number 2 Cylinder Misfire Detected) in a 2004 Nissan Altima Sedan make the issue go away?

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

Discuss the causes and fixes for P0302 2004 Nissan Altima Sedan OBDII Code

Submit a New Comment

Code P0302 2004 Nissan Altima Sedan comments

No comments found for this page.