Engine-Codes.com
Engine-Codes – Nissan – P0302 2011 Nissan Altima Sedan

P0302 2011 Nissan Altima Sedan Code - Number 2 Cylinder Misfire Detected

Quick Answer

The diagnostic trouble code P0302 in a 2011 Nissan Altima Sedan indicates that a misfire has been detected in the number 2 cylinder of the engine. Common causes include Faulty spark plug in the number 2 cylinder, Malfunctioning ignition coil, Vacuum leak in the intake manifold or vacuum hoses. 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 2011 Nissan Altima Sedan indicates Number 2 Cylinder Misfire Detected.
Common causes
Common causes include Faulty spark plug in the number 2 cylinder, Malfunctioning ignition coil, Vacuum leak in the intake manifold or vacuum hoses.
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 11, 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 2011 Nissan Altima Sedan Description

The diagnostic trouble code P0302 in a 2011 Nissan Altima Sedan indicates that a misfire has been detected in the number 2 cylinder of the engine. This means that the engine is not running smoothly or efficiently in that particular cylinder, leading to a decrease in performance, fuel efficiency, and overall driveability of the vehicle. A misfire occurs when the fuel-air mixture in the cylinder fails to ignite at the right time or does not ignite at all, resulting in a lack of power, rough idling, and potentially causing damage to other components of the engine.

OBDII Code P0302 2011 Nissan Altima Sedan - Number 2 Cylinder Misfire Detected
P0302 2011 Nissan Altima Sedan Code - Number 2 Cylinder Misfire Detected

Common Causes of P0302 2011 Nissan Altima Sedan

  1. Faulty spark plug in the number 2 cylinder.
  2. Malfunctioning ignition coil.
  3. Vacuum leak in the intake manifold or vacuum hoses.
  4. Clogged or malfunctioning fuel injector.
  5. Low compression in the number 2 cylinder.

Symptoms of P0302 2011 Nissan Altima Sedan

  1. Rough idling or shaking sensation while the vehicle is at a standstill.
  2. Decreased acceleration and power when accelerating.
  3. Increased fuel consumption.
  4. Check Engine light illuminated on the dashboard.
  5. Engine may emit a noticeable knocking sound while running.

How to Fix P0302 2011 Nissan Altima Sedan

  1. Begin by diagnosing the specific cause of the misfire, such as testing the spark plug, ignition coil, fuel injector, and compression in the number 2 cylinder.
  2. Replace the faulty spark plug in the number 2 cylinder if it is found to be the cause of the misfire.
  3. Test and potentially replace the ignition coil if it is malfunctioning and causing the misfire.
  4. Check for and repair any vacuum leaks in the intake manifold or vacuum hoses that could be contributing to the misfire.
  5. If the misfire persists, perform a compression test on the number 2 cylinder to determine if low compression is the root cause of the issue.

Cost to Fix P0302 2011 Nissan Altima Sedan

The cost of repairing a misfire in the number 2 cylinder of a 2011 Nissan Altima Sedan can vary depending on the specific cause of the issue and the parts and labor required for the repair. On average, the cost of replacing a faulty spark plug can range from $50 to $150, while replacing an ignition coil can cost between $150 and $300. Repairing vacuum leaks or a clogged fuel injector may require additional labor and parts costs. In total, the repair for a misfire in the number 2 cylinder could range from $200 to $500 or more, depending on the extent of the issue and the specific repairs needed.

What does this mean?

Tech Notes for P0302 2011 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 2011 Nissan Altima Sedan code?

Need more information on how to fix the P0302 2011 Nissan Altima Sedan code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0302 2011 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 2011 Nissan Altima Sedan Code

1. What are the common symptoms of OBDII code P0302 in a 2011 Nissan Altima Sedan?

A: Common symptoms of code P0302, indicating a misfire in the number 2 cylinder, include rough idling, loss of power, engine vibration, and possible hesitation during acceleration.

2. What are the possible causes of a number 2 cylinder misfire in a 2011 Nissan Altima?

A: The misfire in the number 2 cylinder can be caused by issues such as a faulty ignition coil, spark plug, fuel injector, vacuum leak, or even low compression in the cylinder.

3. How can I diagnose the specific cause of the number 2 cylinder misfire in my 2011 Nissan Altima Sedan?

A: To diagnose the exact cause of the misfire, you may need to perform tests such as checking spark plugs, inspecting ignition coils, scanning for other related trouble codes, conducting a compression test, and looking for vacuum leaks.

4. Can driving with OBDII code P0302 in a 2011 Nissan Altima Sedan cause further damage?

A: Continuing to drive with a misfire in the number 2 cylinder can potentially lead to damage to the catalytic converter and other engine components, so it is recommended to address the issue promptly.

5. How can I repair a number 2 cylinder misfire in my 2011 Nissan Altima Sedan?

A: Repairing a misfire in the number 2 cylinder may involve replacing faulty spark plugs, ignition coils, or fuel injectors, fixing vacuum leaks, addressing compression issues, and clearing the trouble code with an OBDII scanner.

6. Is it safe to clear the OBDII code P0302 in a 2011 Nissan Altima Sedan without fixing the underlying issue?

A: Clearing the trouble code without addressing the root cause of the misfire can temporarily turn off the check engine light, but the issue will likely persist and may lead to further problems down the line.

7. Can bad fuel quality or a clogged fuel filter cause OBDII code P0302 in a 2011 Nissan Altima Sedan?

A: Poor fuel quality or a clogged fuel filter can indeed contribute to a misfire in the number 2 cylinder, as they can affect the fuel delivery and combustion process in the engine.

8. How often should I replace spark plugs in a 2011 Nissan Altima Sedan to prevent OBDII code P0302?

A: It is generally recommended to replace spark plugs every 30,000 to 50,000 miles in a 2011 Nissan Altima Sedan to maintain optimal engine performance and prevent misfires like code P0302.

9. Are there any preventive maintenance tips to avoid encountering OBDII code P0302 in a 2011 Nissan Altima Sedan?

A: Regularly servicing your vehicle, including changing spark plugs, inspecting ignition components, using high-quality fuel, and addressing any engine performance issues promptly, can help prevent misfires like code P0302.

Discuss the causes and fixes for P0302 2011 Nissan Altima Sedan OBDII Code

Submit a New Comment

Code P0302 2011 Nissan Altima Sedan comments

No comments found for this page.