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P0302 Infiniti Code - Number 2 Cylinder Misfire Detected

Quick Answer

When the OBD-II code P0302 appears on an Infiniti vehicle, it indicates that a misfire has been detected in the number 2 cylinder of the engine. Common causes include Faulty ignition coil, Spark plug issues, Clogged 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 Infiniti indicates Number 2 Cylinder Misfire Detected.
Common causes
Common causes include Faulty ignition coil, Spark plug issues, Clogged 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 Aug 30, 2024
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Code P0302 Infiniti Description

When the OBD-II code P0302 appears on an Infiniti vehicle, it indicates that a misfire has been detected in the number 2 cylinder of the engine. This means that the cylinder is not firing properly, which can lead to a range of performance issues. A misfire can cause a lack of power, rough idling, hesitation, and potentially even engine stalling. Ignoring this code can lead to damage to the catalytic converter, increased emissions, and reduced fuel efficiency. The misfire is typically caused by issues with the ignition system, fuel system, or internal engine components.

OBDII Code P0302 Infiniti - Number 2 Cylinder Misfire Detected
P0302 Infiniti Code - Number 2 Cylinder Misfire Detected

Common Causes of P0302 Infiniti

  1. Faulty ignition coil
  2. Spark plug issues
  3. Clogged fuel injector
  4. Vacuum leak
  5. Low compression in the number 2 cylinder

Symptoms of P0302 Infiniti

  1. Rough idling
  2. Loss of power
  3. Engine hesitation
  4. Engine shaking or vibrating
  5. Decreased fuel efficiency

How to Fix P0302 Infiniti

  1. Perform a thorough inspection of the ignition system, including the ignition coil and spark plug in the number 2 cylinder.
  2. Check the fuel injector for clogs or malfunctions and clean or replace as needed.
  3. Inspect the vacuum lines for any leaks and repair or replace as necessary.
  4. Perform a compression test on the number 2 cylinder to check for any internal engine issues.
  5. Clear the diagnostic trouble codes, test drive the vehicle, and re-scan to ensure the misfire has been resolved.

Cost to Fix P0302 Infiniti

The cost of repairing a P0302 code on an Infiniti can vary depending on the specific cause of the misfire. On average, the repair costs can range from $100 to $500, including parts and labor. This estimate does not include the cost of diagnostic testing, which can vary depending on the shop's rates. It's recommended to get a detailed quote from a trusted auto repair shop before proceeding with the repairs.

What does this mean?

Tech Notes for P0302 Infiniti

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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Information for Specific Infiniti Models

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 Infiniti Code

No Frequently Asked Questions about P0302 Infiniti Code found.

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  • I have a infinity 2003. I had the P0302 I changed the 2cylinder and everything was good until the check engine light turn on and now the P0430 popped up. The P0430 code is set when the ECU detects below threshold performance from the catalytic converter.

    Reply to Comment
  • The P0430 code is set when the ECU detects below threshold performance from the catalytic converter.


    Correct, but before replacing the catalytic converter, try clering the code and using high octane gas for a couple of weeks.

    P0430 INFINITI - Catalyst System Efficiency Below Threshold Bank 2
    Read more: https://www.autocodes.com/p...

    Reply to Comment