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

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, compression tester, fuel injector cleaner.
• Ensure the vehicle is on a flat surface and the engine is cool. Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Sub-steps:
  1. Remove the engine cover (if applicable) using the socket set.
  2. Locate cylinder 1 spark plug (usually at the front of the engine).
  3. Disconnect the ignition coil connector.
  4. Remove the ignition coil using the socket set.
  5. Unscrew the spark plug using a spark plug socket.
  6. Inspect the spark plug for wear or damage; replace if necessary (OEM specifications recommended).
  7. Install a new spark plug, torque to manufacturer specifications (typically around 13 lb-ft).
  8. Reinstall the ignition coil and reconnect the connector.

3. Check and Replace Fuel Injector

• Sub-steps:
  1. Locate the fuel rail and the injector for cylinder 1.
  2. Disconnect the fuel injector electrical connector.
  3. Remove the fuel rail bolts using the socket set.
  4. Carefully lift the fuel rail to access the injector.
  5. Remove the old fuel injector and replace it with a new one (OEM recommended).
  6. Reinstall the fuel rail and ensure all connections are secure.

4. Compression Test

• Sub-steps:
  1. Remove the spark plug from cylinder 1 again for access.
  2. Insert the compression tester into the spark plug hole.
  3. Crank the engine a few times to get a reading.
  4. Compare the compression reading to the specifications (typically between 180-200 psi). If low, further investigation into piston rings or valves may be necessary.