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Engine-Codes – Nissan – P0302 2002 Nissan Altima Sedan

P0302 2002 Nissan Altima Sedan Code - Number 2 Cylinder Misfire Detected

Quick Answer

When the diagnostic code P0302 appears on a 2002 Nissan Altima Sedan, it indicates that a misfire has been detected in the number 2 cylinder of the engine. Common causes include Worn or fouled spark plugs, Faulty ignition coil in the number 2 cylinder, Clogged or malfunctioning fuel injector. 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 2002 Nissan Altima Sedan indicates Number 2 Cylinder Misfire Detected.
Common causes
Common causes include Worn or fouled spark plugs, Faulty ignition coil in the number 2 cylinder, Clogged or malfunctioning fuel injector.
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 10, 2024
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Code P0302 2002 Nissan Altima Sedan Description

When the diagnostic code P0302 appears on a 2002 Nissan Altima Sedan, it indicates that a misfire has been detected in the number 2 cylinder of the engine. A misfire occurs when the fuel-air mixture in the cylinder fails to ignite at the proper time, causing a disruption in the combustion process. This can lead to a rough idle, reduced engine performance, decreased fuel efficiency, and potentially even damage to the catalytic converter over time.

OBDII Code P0302 2002 Nissan Altima Sedan - Number 2 Cylinder Misfire Detected
P0302 2002 Nissan Altima Sedan Code - Number 2 Cylinder Misfire Detected

Common Causes of P0302 2002 Nissan Altima Sedan

  1. Worn or fouled spark plugs.
  2. Faulty ignition coil in the number 2 cylinder.
  3. Clogged or malfunctioning fuel injector.
  4. Vacuum leaks in the intake manifold or vacuum lines.
  5. Low compression in the number 2 cylinder.

Symptoms of P0302 2002 Nissan Altima Sedan

  1. Rough idle or vibrations while the engine is running.
  2. Decreased acceleration and overall engine performance.
  3. Engine stalling or hesitation when accelerating.
  4. Increased fuel consumption.
  5. Check engine light illuminated on the dashboard.

How to Fix P0302 2002 Nissan Altima Sedan

  1. Begin by diagnosing the specific cause of the misfire by performing a thorough inspection of the spark plugs, ignition coils, fuel injectors, and vacuum lines.
  2. Replace any faulty spark plugs in the number 2 cylinder and ensure they are properly gapped.
  3. Test the ignition coil in the number 2 cylinder and replace it if necessary.
  4. Clean or replace the fuel injector in the number 2 cylinder to ensure proper fuel delivery.
  5. Check the compression in the number 2 cylinder to rule out any internal engine issues and address if necessary.

Cost to Fix P0302 2002 Nissan Altima Sedan

The typical repair costs for addressing a number 2 cylinder misfire on a 2002 Nissan Altima Sedan can vary depending on the specific cause of the issue. In general, parts such as spark plugs, ignition coils, or fuel injectors can range from $50 to $200 each, while labor costs can add an additional $100 to $300. Overall, the total repair cost for this issue may fall in the range of $200 to $800, but it's essential to consult with a qualified mechanic for a more accurate estimate based on the vehicle's specific diagnosis and repair needs. Labor rates at auto repair shops can vary, so it's advisable to research local rates and compare estimates to ensure a fair price for the repair.

What does this mean?

Tech Notes for P0302 2002 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.

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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 2002 Nissan Altima Sedan Code

1. What are the common symptoms of OBDII code P0302 in a 2002 Nissan Altima Sedan?

The common symptoms include engine misfiring, rough idling, loss of power, and potential increase in fuel consumption.

2. What are the possible causes of OBDII code P0302 in a 2002 Nissan Altima Sedan?

The code P0302 indicates a misfire in the number 2 cylinder, which can be caused by issues such as faulty spark plugs, ignition coils, fuel injectors, or a vacuum leak.

3. How can I diagnose the source of the misfire in the number 2 cylinder of my 2002 Nissan Altima Sedan?

Diagnosing the issue may involve checking the spark plug, ignition coil, fuel injector, and vacuum lines related to the number 2 cylinder for any signs of damage or malfunction.

4. Can a dirty or clogged fuel injector cause OBDII code P0302 in a 2002 Nissan Altima Sedan?

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 trouble code.

5. What repair tips can help resolve OBDII code P0302 in a 2002 Nissan Altima Sedan?

Some repair tips include replacing the spark plugs, ignition coils, or fuel injectors related to the number 2 cylinder, as well as addressing any vacuum leaks in the intake system.

6. Is it safe to continue driving my 2002 Nissan Altima Sedan with OBDII code P0302?

Continuing to drive with a misfire can potentially cause damage to the engine or catalytic converter. It is recommended to address the issue promptly to prevent further complications.

7. How much can I expect to pay for repairing OBDII code P0302 in a 2002 Nissan Altima Sedan?

The cost of repairs for OBDII code P0302 can vary depending on the exact cause of the misfire and the parts/labour rates in your area. It is advisable to consult a mechanic for an accurate estimate.

8. Can a faulty oxygen sensor trigger OBDII code P0302 in a 2002 Nissan Altima Sedan?

While a faulty oxygen sensor is not a direct cause of a cylinder misfire, it can affect the air-fuel mixture and potentially contribute to misfire issues, including triggering the P0302 code.

9. Will resetting the OBDII code P0302 in my 2002 Nissan Altima Sedan make the issue go away?

Resetting the code without addressing the underlying cause of the misfire will not solve the problem. It is essential to diagnose and repair the issue to prevent the code from reappearing.

10. How can regular maintenance help prevent OBDII code P0302 in a 2002 Nissan Altima Sedan?

Regular maintenance, including timely replacement of spark plugs, ignition components, and fuel system cleaning, can help prevent issues like misfires that lead to the triggering of OBDII code P0302.

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