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Engine-Codes – Honda – P0304 2019 Honda CR-V

P0304 2019 Honda CR-V Code - No. 4 Cylinder Misfire Detected

Quick Answer

When the diagnostic trouble code P0304 appears on a 2019 Honda CR-V, it indicates that a misfire has been detected in the No. Common causes include Worn or fouled spark plugs, Faulty ignition coil, Clogged or malfunctioning fuel injector. 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
P0304 2019 Honda CR-V indicates No. 4 Cylinder Misfire Detected.
Common causes
Common causes include Worn or fouled spark plugs, Faulty ignition coil, Clogged or malfunctioning fuel injector.
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 11, 2024
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Code P0304 2019 Honda CR-V Description

When the diagnostic trouble code P0304 appears on a 2019 Honda CR-V, it indicates that a misfire has been detected in the No. 4 cylinder of the engine. A misfire occurs when the fuel-air mixture in the cylinder fails to ignite properly, causing the engine to run rough, lose power, and potentially emit excessive emissions. This can lead to decreased fuel efficiency, rough idling, hesitation or jerking during acceleration, and in severe cases, engine stalling.

OBDII Code P0304 2019 Honda CR-V - No. 4 Cylinder Misfire Detected
P0304 2019 Honda CR-V Code - No. 4 Cylinder Misfire Detected

Common Causes of P0304 2019 Honda CR-V

  1. Worn or fouled spark plugs
  2. Faulty ignition coil
  3. Clogged or malfunctioning fuel injector
  4. Vacuum leaks in the intake manifold or hoses
  5. Low compression in the No. 4 cylinder

Symptoms of P0304 2019 Honda CR-V

  1. Rough idling or vibrations while driving
  2. Loss of power or acceleration
  3. Engine misfires or hesitation during acceleration
  4. Illumination of the check engine light
  5. Increased fuel consumption

How to Fix P0304 2019 Honda CR-V

  1. Perform a visual inspection of the spark plugs, ignition coil, and fuel injector for any signs of damage or wear.
  2. Test the compression in the No. 4 cylinder to ensure it is within the manufacturer's specifications.
  3. Check for vacuum leaks using a smoke machine or a can of carburetor cleaner sprayed around the intake manifold and vacuum hoses.
  4. Replace any faulty spark plugs, ignition coils, or fuel injectors as needed.
  5. If compression is low, further diagnosis may be required to determine the cause, such as a leaking head gasket or worn piston rings.

Cost to Fix P0304 2019 Honda CR-V

The cost of repairing a No. 4 cylinder misfire on a 2019 Honda CR-V can vary depending on the specific cause of the issue and the cost of parts and labor in your area. In general, replacing spark plugs, ignition coils, or fuel injectors can range from $100 to $300 per part, not including labor costs. Labor rates at auto repair shops can range from $80 to $150 per hour, so the total cost of repairs could be anywhere from $200 to $800 or more. It's best to consult with a trusted mechanic for a more accurate estimate based on your individual circumstances.

What does this mean?

Tech Notes for P0304 2019 Honda CR-V

The P0304 code means that cylinder #4 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 #4. If the problem persists more tests need to be done to diagnose the problem, see "Possible Causes".

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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 P0304 2019 Honda CR-V Code

1. What does the OBDII code P0304 mean on a 2019 Honda CR-V?

P0304 indicates that the engine control module (ECM) has detected a misfire in cylinder number 4.

2. What are the common symptoms of a P0304 code in a 2019 Honda CR-V?

Symptoms may include rough idling, reduced engine performance, poor fuel economy, hesitation during acceleration, and the Check Engine Light being illuminated.

3. What causes a P0304 code on the 2019 Honda CR-V?

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

4. Can I drive my 2019 Honda CR-V with a P0304 code?

While the car may still be drivable, continued operation with a cylinder misfire can cause further engine damage, reduced performance, and increased emissions. It is best to address the issue promptly.

5. How do I fix a P0304 code on a 2019 Honda CR-V?

Repairs may involve replacing the spark plug or ignition coil for cylinder 4, cleaning or replacing the fuel injector, fixing vacuum leaks, or performing a compression test to address internal engine issues.

6. How can I diagnose the cause of a P0304 code on my CR-V?

Start by inspecting the spark plug and ignition coil for cylinder 4. If they appear fine, check the fuel injector, vacuum lines, and perform a compression test. A diagnostic scan tool can also provide live data to help pinpoint the issue.

7. How much does it cost to fix a P0304 code on a 2019 Honda CR-V?

Repair costs vary depending on the cause, ranging from $100–$300 for spark plug or ignition coil replacement to $500–$1,000 for more complex issues like fuel injector replacement or internal engine repairs.

8. Can a dirty air filter cause a P0304 code on a 2019 Honda CR-V?

While unlikely, a severely clogged air filter can affect engine performance and contribute to misfires. It’s a good idea to check the air filter as part of regular maintenance.

9. Will a P0304 code cause long-term damage to my 2019 Honda CR-V?

If left unresolved, a misfire can damage the catalytic converter, increase engine wear, and lead to more expensive repairs.

10. Do I need special tools to fix a P0304 code on my 2019 Honda CR-V?

Basic tools such as a spark plug socket and wrench may be sufficient for minor repairs. However, diagnosing and repairing more complex issues may require a diagnostic scan tool, compression tester, or fuel pressure gauge.

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