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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to avoid any electrical shorts.
• Allow the engine to cool before beginning work.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket
• Remove the ignition coil from cylinder 1:
  1. Unscrew the mounting bolt.
  2. Gently pull the ignition coil out of the spark plug hole.
• Remove the spark plug:
  1. Use the spark plug socket to unscrew the spark plug from the cylinder head.
  2. Inspect the spark plug for signs of wear (e.g., excessive carbon buildup, worn electrodes).
• Install the new spark plug:
  1. Hand-tighten the new spark plug, then use the torque wrench to tighten it to the manufacturer-recommended torque (usually around 13-15 lb-ft).
• Reinstall the ignition coil:
  1. Align it over the spark plug and press down until it clicks into place.
  2. Secure it with the mounting bolt.

3. Check and Replace Ignition Coil (if necessary)

• If the spark plug appears normal, check the ignition coil:
  1. Use a multimeter to test the primary and secondary resistance of the ignition coil.
  2. If out of specification, replace the ignition coil with a new one.
• Reinstall the ignition coil as described above.

4. Fuel Injector Inspection

• Tools Required: Fuel injector cleaning kit or replacement injector
• Disconnect the fuel injector connector for cylinder 1.
• Perform an electrical test on the injector to ensure it is receiving power.
• If faulty, replace the fuel injector:
  1. Remove the old injector by releasing the retaining clips.
  2. Install the new injector and ensure it is seated properly.

5. Reconnect Battery and Clear Codes

• Reconnect the battery terminal.
• Use the OBD-II scanner to clear the P0301 code.

6. Test Drive

• Start the engine and observe for any abnormal behavior.
• Take the vehicle for a test drive to ensure the issue is resolved.