how to fix P0301 misfire code on Honda Civic 9th Generation (2012-2015)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Ensure the engine is cool before proceeding.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the ignition coil from cylinder 1:
  • Unscrew the coil mounting bolt and gently pull the coil out.
• Remove the old spark plug using a spark plug socket.
• Inspect the gap of the new spark plug; adjust to manufacturer specifications if necessary.
• Install the new spark plug:
  • Torque to 13 lb-ft (18 Nm) using a torque wrench.
• Reinstall the ignition coil and secure it with its bolt.

3. Inspect and Replace Ignition Coil (if necessary)

• If the ignition coil appears damaged or was previously misfiring, replace it:
  • Disconnect the electrical connector from the coil.
  • Remove the coil from the cylinder head.
  • Install the new ignition coil and reconnect the electrical connector.

4. Check and Replace Fuel Injector (if necessary)

• If the injector is faulty, replace it:
  • Disconnect the fuel injector electrical connector.
  • Remove the fuel rail if necessary to access the injector.
  • Pull out the old injector and install the new one, ensuring proper seating.
  • Reassemble the fuel rail and reconnect the electrical connector.

5. Final Assembly and Reconnect Battery

• Reinstall any components removed during the repair.
• Reconnect the negative battery terminal.