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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative terminal of the battery to prevent electrical shorts.
• Allow the engine to cool completely before starting work.

2. Inspect and Replace Spark Plug

• Remove the engine cover if applicable.
• Use a socket wrench to remove the spark plug from cylinder 1.
• Inspect the spark plug for wear or deposits; replace it with a new spark plug if damaged.
  • Torque the new spark plug to the manufacturer's specification (usually around 13-16 ft-lbs).
• Reinstall the ignition coil onto the new spark plug.

3. Inspect and Replace Ignition Coil

• Disconnect the electrical connector from the ignition coil for cylinder 1.
• Remove the mounting bolts securing the ignition coil.
• Replace with a new ignition coil and secure it in place.
• Reconnect the electrical connector.

4. Check and Replace Fuel Injector (if necessary)

• Disconnect the fuel injector connector and remove the retaining clip.
• Carefully pull out the fuel injector from cylinder 1.
• Replace with a new fuel injector if it’s faulty or clogged.
• Reinstall the injector and secure it with the retaining clip.

5. Perform a Compression Test

• Reconnect the battery terminal.
• Use a compression tester to check the compression in cylinder 1.
• If compression is low, further investigation into the engine’s internal components may be needed.