AutoCodes – Toyota – P0302 2008 Toyota Prius

P0302 2008 Toyota Prius 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 2008 Toyota Prius 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 6,350

How popular is this code, among other codes? Low

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 2008 Toyota Prius 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 2008 Toyota Prius - Cylinder 2 Misfire Detected - AutoCodes.com — P0302 2008 Toyota Prius Code - Cylinder 2 Misfire Detected

What does this mean?

What are the Possible Causes of the DTC P0302 2008 Toyota Prius?

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
Valve timing
Mass air flow meter
Engine coolant temperature sensor
ECM

How to Fix the DTC P0302 2008 Toyota Prius?

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 2008 Toyota Prius 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.

Need more information about the P0302 2008 Toyota Prius code?

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Need Help with the Code?

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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 2008 Toyota Prius Code

1. What are the common symptoms of OBDII code P0302 (Cylinder 2 Misfire Detected) on a 2008 Toyota Prius?

- Common symptoms include rough engine idle, loss of power, engine misfiring, and potentially an illuminated check engine light.

2. What are the possible causes of a Cylinder 2 misfire in a 2008 Toyota Prius?

- Common causes include faulty ignition coil, spark plug, fuel injector, vacuum leak, low compression, or wiring issues.

3. How can I diagnose the source of the Cylinder 2 misfire in my 2008 Toyota Prius?

- Diagnosing the issue typically involves checking the ignition coil, spark plug, fuel injector, compression in cylinder 2, and inspecting for vacuum leaks.

4. Can driving with a misfiring Cylinder 2 on a 2008 Toyota Prius cause further damage?

- Yes, driving with a misfire can lead to damage to the catalytic converter, oxygen sensor, or other engine components over time.

5. How can I repair a Cylinder 2 misfire on my 2008 Toyota Prius?

- Depending on the exact cause, repairs may involve replacing the ignition coil, spark plug, fuel injector, addressing vacuum leaks, or performing a compression test.

6. Is it safe to continue driving my 2008 Toyota Prius with a Cylinder 2 misfire?

- It is not recommended to drive with a misfire as it can lead to further damage and reduced fuel efficiency. It's best to address the issue promptly.

7. Can a dirty fuel injector cause a Cylinder 2 misfire in a 2008 Toyota Prius?

- Yes, a dirty or clogged fuel injector can disrupt the proper fuel delivery to Cylinder 2, potentially causing a misfire.

8. How much does it typically cost to repair a Cylinder 2 misfire on a 2008 Toyota Prius?

- Repair costs can vary depending on the exact cause and parts needed, but it can range from $100 to $500 or more at a repair shop.

9. Will resetting the check engine light resolve a Cylinder 2 misfire in a 2008 Toyota Prius?

- Resetting the check engine light may temporarily clear the code, but it won't fix the underlying issue causing the misfire in Cylinder 2.

10. How often should I perform maintenance to prevent Cylinder 2 misfires in my 2008 Toyota Prius?

- Regular maintenance, including spark plug replacements, fuel system cleaning, and engine tune-ups, can help prevent Cylinder 2 misfires in your Prius.