how can I solve the P0301 misfire code on my Honda Civic 10th Generation (2016-2021)

Solution

1. Preparation

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

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the ignition coil from cylinder 1:
  • Unscrew the bolts securing the ignition coil.
  • Gently pull the ignition coil out of the spark plug hole.
• Remove the old spark plug:
  • Use the spark plug socket to unscrew the old spark plug from the cylinder head.
• Install the new spark plug:
  • Apply anti-seize compound to the threads of the new spark plug (if recommended by the manufacturer).
  • Hand-tighten the spark plug, then torque to the manufacturer's specifications (typically around 13-16 lb-ft).
• Reinstall the ignition coil, ensuring it is seated properly and secure it with bolts.

3. Replace Ignition Coil (if needed)

• If the ignition coil appears damaged, replace it:
  • Disconnect the electrical connector from the ignition coil.
  • Remove the ignition coil following the steps in the previous section.
  • Install the new ignition coil in the reverse order, ensuring proper alignment.

4. Check Fuel Injector

• Tools Required: Fuel injector tester or multimeter.
• Test the fuel injector for cylinder 1:
  • Connect the fuel injector tester to the injector connector.
  • Verify that the injector is receiving the correct voltage and is functioning properly.
• If faulty, replace the fuel injector:
  • Disconnect the fuel line (use caution to avoid fuel spray).
  • Remove the old injector and install a new one, ensuring it is seated correctly.

5. Compression Test

• Tools Required: Compression tester.
• Perform a compression test on cylinder 1:
  • Remove the spark plug and install the compression tester.
  • Crank the engine and record the reading.
  • Compare to manufacturer specifications; if low, further investigation is required for possible mechanical issues.