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

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shock.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the ignition coil from cylinder 1:
  • Unplug the electrical connector.
  • Remove the retaining bolt and lift the coil out.
• Remove the spark plug using a spark plug socket:
  • Turn counterclockwise to unscrew.
  • Inspect the spark plug for signs of fouling, wear, or damage.
• Install a new spark plug:
  • Apply anti-seize compound to the threads (if applicable).
  • Torque to the manufacturer’s specification (typically around 13 ft-lbs).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Check and Replace Ignition Coil (if needed)

• If the ignition coil shows signs of wear or damage:
  • Remove the old ignition coil as done in the previous step.
  • Install a new ignition coil for cylinder 1.
  • Reconnect the electrical connector.

4. Compression Test

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 1.
• Insert the compression tester into the spark plug hole.
• Crank the engine a few times and note the reading:
  • Compare the reading to the manufacturer’s specifications.
  • If low, further investigation of valve or piston issues is necessary.

5. Fuel Injector Inspection

• Tools Required: Noid light or multimeter.
• Disconnect the fuel injector connector for cylinder 1.
• Use a noid light to check for injector pulse:
  • If the light does not flash, check wiring and PCM.
• If pulse is present, consider cleaning or replacing the fuel injector.