AutoCodes – Honda – P0303 2021 Honda CR-V

P0303 2021 Honda CR-V Code - No. 3 Cylinder Misfire Detected

Quick Answer

The crankshaft vibrates slightly when each cylinder fires. Common causes include Valve adjustment, Faulty spark plug #3, Faulty ignition coil #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 2021 Honda CR-V indicates No. 3 Cylinder Misfire Detected.
Common causes: Common causes include Valve adjustment, Faulty spark plug #3, Faulty ignition coil #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.

Save to My Repairs Step-by-Step Diagnostic Guide My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 242

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 Aug 16, 2023

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P0303 2021 Honda CR-V Description

The crankshaft vibrates slightly when each cylinder fires. If a misfire occurs, the crankshaft rotation speed changes rapidly. The Powertrain Control Module (PCM) monitors the crankshaft rotation speed based on the output pulses from the Crankshaft Position (CKP) Sensor. By monitoring changes in the crankshaft rotation speed, the PCM counts the number of misfires and determines which cylinder is misfiring. If a misfire is detected, a Diagnostic Trouble Code (DTC) is stored.
There are two types of misfire detection: Type 1: When the number of misfires per 200 engine revolutions reaches the level that can damage the three-way catalyst (TWC), a DTC is stored and the MIL blinks. Type 2: When the number of misfires per 1,000 engine revolutions reaches the level that affects exhaust emissions but is not severe enough to immediately damage the catalyst, a DTC is stored, and the MIL comes on.

OBDII Code P0303 2021 Honda CR-V - No. 3 Cylinder Misfire Detected - AutoCodes.com — P0303 2021 Honda CR-V Code - No. 3 Cylinder Misfire Detected

What does this mean?

What are the Possible Causes of the DTC P0303 2021 Honda CR-V?

Valve adjustment
Faulty spark plug #3
Faulty ignition coil #3
Clogged or faulty fuel injector #3
Intake air leak
Insufficient cylinder #3 compression
Incorrect fuel pressure

How to Fix the DTC P0303 2021 Honda CR-V?

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 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 need to be done to diagnose the problem, see "Possible Causes".

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0303 2021 Honda CR-V 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 2021 Honda CR-V code?

Need more information on how to fix the P0303 2021 Honda CR-V code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0303 2021 Honda CR-V 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 P0303 2021 Honda CR-V Code

1. What does the OBDII code P0303 mean for a 2021 Honda CR-V?

P0303 indicates a misfire has been detected in cylinder No. 3 of the engine, which can affect performance and emissions.

2. What are the symptoms of a P0303 code in a Honda CR-V?

Common symptoms include rough idling, engine hesitation, reduced fuel efficiency, loss of power, and the check engine light turning on.

3. What causes a P0303 code in a 2021 Honda CR-V?

Possible causes include a faulty spark plug, bad ignition coil, clogged fuel injector, vacuum leak, low compression, or issues with the engine control module (ECM).

4. Can a dirty or clogged fuel injector cause a P0303 code?

Yes, a dirty or clogged fuel injector in cylinder No. 3 can disrupt fuel delivery and cause a misfire.

5. How do I fix a P0303 code on my Honda CR-V?

Repairs may include replacing the spark plug or ignition coil for cylinder No. 3, cleaning or replacing the fuel injector, checking for vacuum leaks, or addressing compression issues.

6. Is it safe to drive a 2021 Honda CR-V with a P0303 code?

Driving with a P0303 code can damage the engine or catalytic converter over time. Itâ€™s best to diagnose and fix the issue promptly.

7. How can I diagnose the cause of a P0303 code?

Start by inspecting the spark plug, ignition coil, and fuel injector for cylinder No. 3. A compression test or vacuum leak check may also be necessary.

8. Can low fuel pressure cause a P0303 code in a Honda CR-V?

Yes, low fuel pressure can lead to insufficient fuel delivery to cylinder No. 3, resulting in a misfire.

9. Could a vacuum leak trigger a P0303 code?

Yes, a vacuum leak near cylinder No. 3 can cause an air-fuel mixture imbalance, leading to a misfire.

10. How much does it cost to fix a P0303 code on a 2021 Honda CR-V?

Repair costs vary, but replacing a spark plug or ignition coil typically costs $100â€“$300, while more complex issues like compression problems can be more expensive.