how to fix P0304 misfire code in Honda CR-V Fifth Generation (2017-2022)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to ensure safety.

2. Replace Spark Plug

• Remove the ignition coil from cylinder 4.
• Use a spark plug socket to remove the spark plug from cylinder 4.
• Inspect the new spark plug to ensure it matches specifications (gap and type).
• Install the new spark plug into cylinder 4 and torque it to the manufacturer’s specification (typically around 13-16 ft-lbs).
• Reattach the ignition coil securely.

3. Replace Ignition Coil (if necessary)

• If the ignition coil tested faulty, remove the ignition coil from cylinder 4.
• Install a new ignition coil and secure it properly.
• Reconnect any electrical connectors.

4. Clean or Replace Fuel Injector (if necessary)

• If the fuel injector shows signs of blockage, use a fuel injector cleaner to flush it.
• If cleaning does not resolve the issue, remove the fuel injector from cylinder 4.
• Install a new fuel injector, ensuring it seats properly and is connected.

5. Reassemble and Reconnect

• Reconnect the battery.
• Start the engine and check for any misfire symptoms.