how to fix P0301 misfire code on Honda Civic 11th Generation (2022-Present)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the vehicle is on a flat surface and the engine is cool.
• Disconnect the negative terminal of the battery to prevent electrical shorts.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the ignition coil from cylinder 1.
• Remove the old spark plug using the spark plug socket.
• Inspect the spark plug for wear; if it is worn or fouled, replace it with a new spark plug.
• Torque the new spark plug to the manufacturer's specification (typically around 13-16 lb-ft).
• Reinstall the ignition coil securely.

3. Replace Ignition Coil (if necessary)

• Tools Required: Socket set, torque wrench.
• If the ignition coil shows signs of failure during inspection, remove the old coil.
• Install the new ignition coil and torque it to specification (usually around 7-12 lb-ft).
• Reconnect the electrical connector.

4. Inspect and Clean Fuel Injector

• Tools Required: Fuel injector cleaning kit, safety glasses.
• Remove the fuel rail if necessary to access the injector for cylinder 1.
• Use a fuel injector cleaner to clean the injector or replace it if it is clogged or faulty.
• Reinstall the fuel rail and ensure all connections are secure.

5. Perform Compression Test (if needed)

• Tools Required: Compression gauge.
• Remove the spark plug from cylinder 1.
• Insert the compression gauge into the spark plug hole and crank the engine.
• Compare the reading to the manufacturer's specifications (usually between 180-200 psi).
• If the compression is low, further inspection of the engine internals may be required.