how to fix P0301 misfire code in my Honda Pilot YF4 (2023-Present)

Solution

1. Preparation

• Gather tools: OBD-II scanner, socket set, torque wrench, multimeter, compression tester.
• Ensure the vehicle is parked 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 necessary.
  2. Locate the spark plug for cylinder 1.
  3. Use a socket wrench to remove the spark plug.
  4. Inspect the spark plug for wear or deposits. Replace if necessary (Use NGK or Denso replacement spark plugs).
  5. Torque the new spark plug to the manufacturer's specified value (usually around 13-16 lb-ft).

3. Check and Replace Ignition Coil

• Sub-steps:
  1. Disconnect the electrical connector from the ignition coil of cylinder 1.
  2. Remove the bolt securing the ignition coil and carefully pull it out.
  3. Inspect the ignition coil for damage and replace it if needed (OEM or equivalent recommended).
  4. Reinstall the new ignition coil and reconnect the electrical connector.

4. Test Fuel Injector

• Sub-steps:
  1. Disconnect the fuel injector connector for cylinder 1.
  2. Use a multimeter to check for proper voltage and resistance according to the service manual specification.
  3. If the injector is faulty, remove it and replace it with a new OEM fuel injector.
  4. Reconnect the fuel injector connector once the new injector is installed.

5. Compression Test

• Sub-steps:
  1. Remove the spark plug from cylinder 1.
  2. Insert the compression tester into the spark plug hole.
  3. Crank the engine and record the compression reading.
  4. Compare the value to the manufacturer's specifications. If low, further investigation of the internal engine components may be necessary.