how to fix P0301 misfire code in Honda Civic 10th Generation (2016-2021)?

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the battery to prevent electrical shorts.
• Allow the engine to cool before starting work.

2. Replace Spark Plug

• Required Tools: Socket set, torque wrench, spark plug socket, anti-seize compound.
• Remove the ignition coil by unscrewing the retaining bolts and disconnecting the electrical connector.
• Remove the old spark plug using a spark plug socket.
• Inspect the spark plug socket for carbon build-up and clean if necessary.
• Apply a small amount of anti-seize compound to the threads of the new spark plug.
• Install the new spark plug hand-tight, then torque it to the manufacturer's specification (typically around 13 lb-ft).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Inspect and Replace Ignition Coil (if necessary)

• Required Tools: Multimeter, socket set.
• If the ignition coil is faulty, disconnect the wiring harness and remove the coil from the spark plug well.
• Use a multimeter to test the coil's resistance; refer to the service manual for specifications.
• Replace the ignition coil with a new one if it fails the test.
• Reconnect the wiring harness and reinstall the coil.

4. Clean or Replace Fuel Injector (if necessary)

• Required Tools: Fuel injector cleaner or replacement injector, socket set.
• Remove the fuel rail, taking care to relieve fuel pressure beforehand.
• Inspect the fuel injector for clogs or damage. If necessary, clean or replace the injector.
• Reinstall the fuel rail and ensure all connections are secure.

5. Perform Compression Test (if necessary)

• Required Tools: Compression gauge.
• Remove the spark plug from cylinder 1.
• Insert the compression gauge into the spark plug hole and crank the engine.
• Record the compression reading and compare it to manufacturer specifications. If low, further engine diagnostics may be needed.