AutoCodes – Subaru – P0302 Subaru

P0302 Subaru Code - Cylinder 2 Misfire Detected

Quick Answer

When a misfire occurs, engine speed will fluctuate. Common causes include Faulty Spark Plug #2, Clogged or faulty Fuel Injector #2, Faulty Ignition Coil #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 #2, Clogged or faulty Fuel Injector #2, Faulty Ignition Coil #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.

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Code Popularity 51,142

How popular is this code, among other codes? Medium

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0302 Subaru Description

When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the Crankshaft Position (CKP) sensor signal to vary, the Engine Control Module (ECM) can determine that a misfire is occurring.

OBDII Code P0302 Subaru - Cylinder 2 Misfire Detected - AutoCodes.com — P0302 Subaru Code - Cylinder 2 Misfire Detected

What does this mean?

What are the Possible Causes of the DTC P0302 Subaru?

Faulty Spark Plug #2
Clogged or faulty Fuel Injector #2
Faulty Ignition Coil #2
Fuel Injector #2 harness is open or shorted
Fuel Injector #2 circuit poor electrical connection
Ignition Coil #2 harness is open or shorted
Ignition Coil #2 circuit poor electrical connection
Insufficient cylinder 2 compression
Incorrect fuel pressure
Intake air leak

How to Fix the DTC P0302 Subaru?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

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"

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0302 Subaru code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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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 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.