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

Solution

1. Preparation

• Tools Required: OBD-II scanner, spark plug socket, torque wrench, compression tester, multimeter, basic hand tools (sockets, wrenches).
• Disconnect the negative terminal of the battery to ensure safety.
• Gather all necessary tools and parts before starting the repair.

2. Replace Spark Plug

• Sub-steps:
  1. Remove the engine cover (if applicable) using the socket set.
  2. Disconnect the ignition coil connector from the cylinder 1 ignition coil.
  3. Remove the ignition coil using the socket set.
  4. Unscrew and remove the spark plug using the spark plug socket.
  5. Inspect the old spark plug for signs of fouling or wear; replace if necessary.
  6. Install the new spark plug hand-tight, then torque it to the manufacturer's specification (usually around 13-15 ft-lbs).
  7. Reinstall the ignition coil and reconnect the connector.

3. Replace Ignition Coil (if necessary)

• Sub-steps:
  1. If the ignition coil is faulty, remove it as described above.
  2. Install the new ignition coil, ensuring it is seated properly.
  3. Reconnect the ignition coil connector securely.

4. Check Fuel Injector

• Sub-steps:
  1. Disconnect the fuel injector connector for cylinder 1.
  2. Use a multimeter to check the injector's resistance; compare with specifications.
  3. If the injector is faulty, remove it and install a new one.
  4. Reconnect the fuel injector connector.

5. Compression Test (if misfire persists)

• Sub-steps:
  1. Remove the spark plug from cylinder 1 again.
  2. Insert the compression tester into the spark plug hole.
  3. Crank the engine and record the compression reading.
  4. Compare the reading with specifications; if low, further diagnostics may be needed.