how to fix P0301 misfire code on Honda Accord 10th Generation (2018-2022)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative terminal of the battery to ensure safety.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench
• Remove the ignition coil from cylinder 1:
  1. Disconnect the electrical connector from the ignition coil.
  2. Remove the bolts securing the ignition coil using a socket wrench.
  3. Carefully pull the coil out of the spark plug hole.
• Remove the spark plug:
  1. Use a spark plug socket to remove the spark plug from cylinder 1.
  2. Inspect the old spark plug for wear, fouling, or damage.
• Install the new spark plug:
  1. Gap the new spark plug according to manufacturer specifications (typically around 0.043 inches for Honda).
  2. Install the new spark plug and torque it to the manufacturer’s specification (usually around 13 lb-ft).
• Reinstall the ignition coil:
  1. Position the ignition coil back into place and secure it with bolts.
  2. Reconnect the electrical connector.

3. Inspect and Replace Ignition Coil (if necessary)

• If the ignition coil appears damaged:
  1. Remove the faulty ignition coil as described above.
  2. Install a new ignition coil specific to Honda Accord (ensure compatibility).
  3. Reconnect the electrical connector.

4. Inspect and Clean Fuel Injector (if necessary)

• If fuel injector issues are suspected:
  1. Disconnect the fuel injector connector.
  2. Remove the fuel rail (follow proper fuel system depressurization procedures).
  3. Inspect the fuel injector for clogs or leaks.
  4. Clean or replace the fuel injector as needed.
  5. Reinstall the fuel rail and reconnect all electrical connections.

5. Compression Testing (if necessary)

• If compression issues are suspected:
  1. Remove spark plugs from all cylinders.
  2. Insert a compression gauge into the cylinder 1 spark plug hole.
  3. Crank the engine to take a reading.
  4. Compare the reading to manufacturer specifications. If low, investigate further for internal engine issues.