how to fix P0301 misfire code in Ford F-150 13th Generation (2015-2020)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the engine is cool and disconnect the negative battery terminal to prevent any electrical shorts.
• Tools Required: Socket set, torque wrench, multimeter, compression tester, OBD-II scanner, fuel injector cleaner.

2. Replace Spark Plug

• Remove the ignition coil from cylinder 1:
  • Unplug the electrical connector.
  • Remove the mounting bolts using a socket wrench.
• Extract the old spark plug using a spark plug socket.
• Inspect the spark plug for wear and gap specifications; if damaged, replace with a new spark plug (OEM recommended).
• Install the new spark plug and torque it to the manufacturer's specifications (typically around 13-15 lb-ft).
• Reinstall the ignition coil, ensuring the connector clicks into place.

3. Replace Ignition Coil

• If the spark plug replacement does not resolve the misfire, proceed to replace the ignition coil:
  • Remove the ignition coil as described in the previous step.
  • Install the new ignition coil and torque to the manufacturer’s specifications.
  • Reconnect the electrical connector.

4. Check Fuel Injector

• If misfire persists, check the fuel injector for cylinder 1:
  • Remove the fuel rail if necessary to access the injector.
  • Disconnect the fuel injector connector and remove the injector from the rail.
  • Test the injector using a multimeter for proper resistance.
  • If faulty, replace the fuel injector and ensure to lubricate the O-ring with engine oil before installation.

5. Compression Test (if necessary)

• If previous steps do not resolve the issue, conduct a compression test:
  • Remove the spark plug from cylinder 1.
  • Insert the compression tester into the spark plug hole.
  • Crank the engine to take the reading. Compare it with specifications (typically 120-150 psi for most engines).
  • If readings are low, further engine diagnostics may be required for potential internal damage.