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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool completely before beginning work.

2. Inspect and Replace Spark Plug

• Tools Required: Spark plug socket, ratchet, torque wrench
• Remove the ignition coil from cylinder 1 by unscrewing the mounting bolts and disconnecting the electrical connector.
• Remove the spark plug using a spark plug socket.
• Inspect the spark plug for fouling or damage; replace if necessary.
• Install the new spark plug, torqueing it to the manufacturer’s specification (typically around 13-16 lb-ft).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Test and Replace Ignition Coil

• Tools Required: Multimeter
• With the ignition coil removed, test the primary and secondary resistance according to the service manual specifications.
• If the ignition coil is out of spec, replace it with a new one.
• Reinstall the ignition coil onto the spark plug and secure it.

4. Check and Replace Fuel Injector

• Tools Required: Fuel injector puller, socket set
• Disconnect the fuel injector electrical connector and remove any retaining clips.
• Pull out the fuel injector using a fuel injector puller.
• Inspect the injector for clogs or damage; clean or replace as necessary.
• Reinstall the fuel injector and reconnect the electrical connector.

5. Perform Compression Test

• Tools Required: Compression tester
• Remove the spark plug for cylinder 1 to access the combustion chamber.
• Insert the compression tester and crank the engine to get a reading.
• Compare the reading to the manufacturer’s specifications; if low, further investigation is needed for potential internal engine issues.