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

Solution

1. Preparation

• Gather tools and parts for the repair.
• Disconnect the negative battery terminal to avoid electrical shorts.

2. Inspect and Replace Spark Plug

• Sub-steps:
  1. Remove the engine cover if necessary.
  2. Disconnect the ignition coil connector for cylinder 1.
  3. Remove the ignition coil from the spark plug.
  4. Use a spark plug socket to remove the spark plug.
  5. Inspect the spark plug for wear or damage; replace if necessary.
  6. Install a new spark plug to the manufacturer’s torque specification (typically around 13 lb-ft for Honda).
  7. Reinstall the ignition coil and connector.

3. Check and Replace Ignition Coil

• Sub-steps:
  1. If the spark plug is in good condition, test the ignition coil with a multimeter.
  2. If the ignition coil is faulty, remove it and replace it with a new one.
  3. Reconnect the ignition coil connector and ensure it is secure.

4. Inspect and Test Fuel Injector

• Sub-steps:
  1. Disconnect the fuel injector connector for cylinder 1.
  2. Use a multimeter to check for proper resistance in the fuel injector.
  3. If the injector is faulty, remove it and replace it with a new one.
  4. Reconnect the fuel injector connector.

5. Compression Test

• Sub-steps:
  1. Insert a compression gauge into the spark plug hole of cylinder 1.
  2. Crank the engine several times and record the compression reading.
  3. Compare the reading to Honda's specifications (typically around 180 psi).
  4. If the compression is low, further investigation is needed (valve issues, head gasket, etc.).

6. Reassemble and Test

• Sub-steps:
  1. Reconnect the negative battery terminal.
  2. Start the engine and observe for smooth operation.
  3. Check for any new codes using the OBD-II scanner.