Engine-Codes.com
Engine-Codes – Subaru – P0302 Subaru

P0302 Subaru Code - Cylinder 2 Misfire Detected

Quick Answer

When a Subaru vehicle displays the diagnostic trouble code P0302, it indicates that a misfire has been detected in cylinder 2 of the engine. Common causes include Faulty spark plug in cylinder 2, Failing ignition coil specific to cylinder 2, Clogged or malfunctioning fuel injector in cylinder 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 Subaru indicates Cylinder 2 Misfire Detected.
Common causes
Common causes include Faulty spark plug in cylinder 2, Failing ignition coil specific to cylinder 2, Clogged or malfunctioning fuel injector in cylinder 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.
What is this?
Table of contents Created and updated by William Orellana on Sep 06, 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 Subaru Description

When a Subaru vehicle displays the diagnostic trouble code P0302, it indicates that a misfire has been detected in cylinder 2 of the engine. This means that the fuel-air mixture in that specific cylinder is not igniting properly, leading to a loss of power, rough idling, and potential engine damage if left unresolved. A misfire can be caused by various factors such as a faulty spark plug, ignition coil, fuel injector, or even a vacuum leak. Ignoring this issue can result in decreased fuel efficiency, increased emissions, and ultimately, engine failure.

OBDII Code P0302 Subaru - Cylinder 2 Misfire Detected
P0302 Subaru Code - Cylinder 2 Misfire Detected

Common Causes of P0302 Subaru

  1. Faulty spark plug in cylinder 2.
  2. Failing ignition coil specific to cylinder 2.
  3. Clogged or malfunctioning fuel injector in cylinder 2.
  4. Vacuum leak affecting cylinder 2.
  5. Low compression in cylinder 2 due to worn piston rings or valves.

Symptoms of P0302 Subaru

  1. Rough idling or vibrations while the vehicle is running.
  2. Loss of power or acceleration.
  3. Engine misfires or hesitation during acceleration.
  4. Increased fuel consumption.
  5. Check engine light illuminated on the dashboard.

How to Fix P0302 Subaru

  1. Begin by diagnosing the specific cause of the misfire by performing a comprehensive engine inspection and using a scan tool to pinpoint the issue to cylinder 2.
  2. Replace the spark plug in cylinder 2 and inspect the ignition coil for any signs of damage or wear.
  3. Clean or replace the fuel injector in cylinder 2 if necessary.
  4. Check for vacuum leaks in the intake manifold or vacuum hoses connected to cylinder 2.
  5. Conduct a compression test on cylinder 2 to ensure that the engine internals are functioning properly.

Cost to Fix P0302 Subaru

The typical repair costs for addressing a cylinder 2 misfire in a Subaru can range from $100 to $500, depending on the specific cause of the issue and the parts needed for the repair. This estimate includes parts and labor, but actual costs may vary based on the location of the repair shop, the make and model of the vehicle, and the severity of the problem. It's recommended to consult with a certified mechanic or dealership for a more accurate cost estimate tailored to your specific situation.

What does this mean?

Tech Notes for P0302 Subaru

The P0302 code means that the 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 needs to be done to diagnose problem, see "Possible Causes"

When is the Code Detected?

Engine Cylinder 2 is Misfiring.

Need more information about the P0302 Subaru code?

Need more information on how to fix the P0302 Subaru code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0302 Subaru 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 Subaru Code

1. What are the common symptoms of OBDII code P0302 in a Subaru indicating a Cylinder 2 misfire?

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

2. What are some possible causes of a Cylinder 2 misfire detected in a Subaru triggering code P0302?

- Causes may 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 the Cylinder 2 misfire in my Subaru with OBDII code P0302?

- Diagnose by checking spark plugs, ignition coils, fuel injectors, vacuum lines, compression in Cylinder 2, and the timing of the engine.

4. Can driving with OBDII code P0302 on a Subaru be harmful to the vehicle?

- Continuing to drive with a Cylinder 2 misfire can potentially cause damage to the catalytic converter and other engine components over time.

5. What are some repair tips for addressing OBDII code P0302 in a Subaru related to a Cylinder 2 misfire?

- Repair tips may include replacing spark plugs, ignition coils, fuel injectors, fixing vacuum leaks, performing a compression test, and ensuring proper engine timing.

6. Is it safe to continue driving my Subaru with a Cylinder 2 misfire and OBDII code P0302?

- It is not recommended to drive for an extended period with a misfire, as it can lead to further damage and potential safety issues.

7. How much does it typically cost to repair a Cylinder 2 misfire in a Subaru triggering OBDII code P0302?

- The cost of repair can vary depending on the specific cause, but it may range from a few hundred to over a thousand dollars, including parts and labor.

8. Will resetting the OBDII code P0302 in my Subaru make the misfire issue go away?

- Resetting the code without addressing the underlying cause will not fix the misfire issue and may result in the code reappearing after driving.

9. Can a DIY enthusiast with some mechanical skills fix the Cylinder 2 misfire causing OBDII code P0302 in a Subaru?

- Depending on the cause, some DIY repairs like replacing spark plugs or ignition coils may be feasible, but more complex issues may require professional attention.

10. How often should I perform maintenance to prevent OBDII code P0302 due to a Cylinder 2 misfire in my Subaru?

- Regular maintenance, including timely spark plug replacements and staying on top of engine tune-ups, can help prevent issues leading to a Cylinder 2 misfire and OBDII code P0302.

Discuss the causes and fixes for P0302 Subaru OBDII Code

Submit a New Comment

Code P0302 Subaru comments

No comments found for this page.