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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery by removing the negative terminal to prevent electrical shock.
• Allow the engine to cool before starting any work.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the ignition coil from cylinder 1 by unscrewing the securing bolts.
• Disconnect the electrical connector from the ignition coil.
• Remove the old spark plug using the spark plug socket.
• Inspect the new spark plug, ensuring it is the correct type and gap.
• Install the new spark plug and torque it to the manufacturer's specifications (typically around 13 lb-ft).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Inspect and Replace Ignition Coil (if necessary)

• If the ignition coil appears damaged or the misfire persists, replace it.
• Tools Required: Socket set.
• Remove the ignition coil as described in Step 2.
• Install the new ignition coil and secure it with the bolts.
• Reconnect the electrical connector.

4. Test Fuel Injector (if necessary)

• If the ignition coil replacement does not resolve the issue, check the fuel injector for cylinder 1.
• Tools Required: Fuel pressure gauge, multimeter.
• Disconnect the fuel injector connector and use a multimeter to check for proper voltage.
• If no voltage is present, further investigation into wiring or ECM may be needed.
• If voltage is present but the injector is not working, replace the fuel injector.