how to fix P0301 misfire code in my Ford Explorer Fifth Generation (2011-2019)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool down before starting work.

2. Replace Spark Plug and Ignition Coil

• Tools Required: Socket set, torque wrench, spark plug socket
• Remove the engine cover if necessary to access the ignition coil.
• Disconnect the ignition coil connector.
• Remove the ignition coil bolt and carefully pull out the coil.
• Use the spark plug socket to remove the spark plug from cylinder 1.
• Inspect the spark plug for wear and replace it if needed.
• Install the new spark plug and tighten to the manufacturer's torque specification (typically around 13-15 lb-ft).
• Reinstall the ignition coil, securing it with the bolt and reconnecting the electrical connector.

3. Check and Replace Fuel Injector

• Tools Required: Fuel injector puller (if necessary), socket set
• Disconnect the fuel injector connector.
• Remove any mounting bolts or clips securing the fuel rail.
• Carefully pull the fuel rail back to access the injector.
• Remove the fuel injector from the rail (replace with a new one if faulty).
• Reinstall the injector, ensuring it is seated correctly, and reassemble the fuel rail.

4. Perform Compression Test (if needed)

• 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 to obtain a reading.
• Compare the reading with the manufacturer's specifications (typically 120-180 psi).
• If compression is low, further diagnosis of engine internals may be required.