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 before working on components.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the ignition coil from cylinder 1 by unfastening the bolts and disconnecting the electrical connector.
• Remove the old spark plug using a spark plug socket.
• Inspect the spark plug for wear; if damaged, replace it with a new one. Use the manufacturer's specified spark plug type.
• Torque the new spark plug to the manufacturer’s specifications (usually around 13-16 lb-ft).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Replace Ignition Coil (if necessary)

• Tools Required: Socket set, torque wrench.
• If the ignition coil appears damaged or previously replaced, follow the same steps to remove the ignition coil.
• Install a new ignition coil, ensuring it is seated correctly.
• Torque the coil mounting bolts to the manufacturer's specifications (usually around 7-10 lb-ft).

4. Check and Clean Fuel Injector

• Tools Required: Fuel injector cleaner kit, basic hand tools.
• If the injector is suspected to be clogged, remove it from the engine.
• Use a fuel injector cleaning kit to clean the injector according to the manufacturer's instructions.
• Reinstall the injector ensuring it is properly seated and connected.

5. Reconnect Battery and Clear Code

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0301 code and check for any new codes.