how to troubleshoot Honda Pilot Third Generation (2016-present) misfire with code P0301

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Tools Required: Spark plug socket, ratchet, torque wrench
• Remove the ignition coil for cylinder 1:
  1. Unplug the electrical connector from the ignition coil.
  2. Remove the bolts securing the ignition coil and pull it out.
• Remove the spark plug:
  1. Use a spark plug socket to unscrew the spark plug from cylinder 1.
  2. Inspect the spark plug for wear or fouling and replace if necessary.
• Install a new spark plug:
  1. Torque the new spark plug to the manufacturer’s specification (typically around 13-16 lb-ft).
  2. Reinstall the ignition coil and reconnect the electrical connector.

3. Inspect and Replace Ignition Coil

• Tools Required: Ratchet, socket set
• If the ignition coil is damaged or malfunctioning:
  1. Remove the ignition coil from cylinder 1 as described in the previous step.
  2. Install the new ignition coil by reversing the removal steps.
  3. Ensure the coil is seated properly and the connector is secure.

4. Check Fuel Injector

• Tools Required: Multimeter, fuel injector cleaning kit (if necessary)
• Test the fuel injector for cylinder 1:
  1. Measure resistance with a multimeter; it should be within manufacturer specifications (usually between 12-16 ohms).
  2. If defective, replace the injector with a new one by removing the fuel rail.
  3. Reconnect the fuel injector and ensure all connections are secure.