AutoCodes – Honda – P0303 2010 Honda Accord

P0303 2010 Honda Accord Code - Cylinder 3 Misfire Detected

Quick Answer

When a misfire occurs, engine speed will fluctuate. Common causes include Valve adjustment, Faulty Spark Plug #3, Clogged or faulty Fuel Injector #3. 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: P0303 2010 Honda Accord indicates Cylinder 3 Misfire Detected.
Common causes: Common causes include Valve adjustment, Faulty Spark Plug #3, Clogged or faulty Fuel Injector #3.
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 16,395

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 Apr 09, 2019

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0303 2010 Honda Accord 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 P0303 2010 Honda Accord - Cylinder 3 Misfire Detected - AutoCodes.com — P0303 2010 Honda Accord Code - Cylinder 3 Misfire Detected

What does this mean?

What are the Possible Causes of the DTC P0303 2010 Honda Accord?

Valve adjustment
Faulty Spark Plug #3
Clogged or faulty Fuel Injector #3
Faulty Ignition Coil #3
Fuel Injector #3 harness is open or shorted
Fuel Injector #3 circuit poor electrical connection
Ignition Coil #3 harness is open or shorted
Ignition Coil #3 circuit poor electrical connection
Insufficient cylinder 3 compression
Incorrect fuel pressure
Intake air leak

How to Fix the DTC P0303 2010 Honda Accord?

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 P0303 code means that the cylinder 3 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 3. 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 P0303 2010 Honda Accord 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 P0303 2010 Honda Accord 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 P0303 2010 Honda Accord Code

1. What does OBDII code P0303 on a 2010 Honda Accord mean?

- OBDII code P0303 indicates a misfire in cylinder 3 of the engine.

2. What are the common symptoms of a cylinder 3 misfire in a 2010 Honda Accord?

- Common symptoms include rough idling, loss of power, engine vibration, and potential fuel efficiency issues.

3. What are the possible causes of a cylinder 3 misfire in a 2010 Honda Accord?

- Causes can include a faulty ignition coil, spark plug, fuel injector, vacuum leak, or low compression in the cylinder.

4. How can I diagnose the source of the cylinder 3 misfire in my 2010 Honda Accord?

- You can use a scan tool to check for the specific code, inspect spark plugs and ignition components, perform a compression test, and look for vacuum leaks.

5. Can driving with a cylinder 3 misfire in a 2010 Honda Accord cause further damage?

- Continuing to drive with a misfire can potentially damage the catalytic converter, so it's best to address the issue promptly.

6. How can I repair a cylinder 3 misfire in my 2010 Honda Accord?

- Repair options include replacing the faulty ignition coil, spark plug, fuel injector, or addressing any vacuum leaks or compression issues.

7. Is it safe to continue driving my 2010 Honda Accord with a cylinder 3 misfire?

- It's not recommended to drive with a misfire as it can lead to further damage and potential safety hazards. It's best to address the issue as soon as possible.

8. How much does it cost to fix a cylinder 3 misfire in a 2010 Honda Accord?

- The cost can vary depending on the specific cause of the misfire and whether you DIY or take it to a mechanic. Costs can range from replacing a spark plug to more extensive repairs.

9. Can a cylinder 3 misfire in a 2010 Honda Accord be fixed at home?

- Depending on your mechanical skills and tools, you may be able to fix the issue at home by replacing spark plugs or ignition components. However, more complex issues may require professional help.

10. How often does a cylinder 3 misfire occur in a 2010 Honda Accord?

- Cylinder 3 misfires, and misfires in general, can occur due to various reasons. Regular maintenance and prompt diagnosis of any issues can help prevent misfires in your Honda Accord.