how to fix P0301 misfire code on Ford F-150 Fourteenth Generation (2021-present)

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, multimeter, compression tester, torque wrench
• Safety Warnings: Disconnect the negative battery terminal before starting work.

2. Inspect and Replace Spark Plug

• Sub-steps:
  1. Remove the engine cover if applicable to access the spark plug.
  2. Use a socket wrench to remove the spark plug from cylinder 1.
  3. Inspect the spark plug for signs of wear, fouling, or damage. Replace if necessary.
  4. Clean the spark plug hole to prevent debris from entering the combustion chamber.
  5. Install the new or cleaned spark plug and torque it to the manufacturer's specifications (typically around 13-15 lb-ft for Ford).

3. Check and Replace Ignition Coil

• Sub-steps:
  1. Disconnect the electrical connector from the ignition coil for cylinder 1.
  2. Remove the ignition coil by unbolting it and pulling it from the spark plug.
  3. Test the ignition coil using a multimeter; compare readings to manufacturer specifications.
  4. If faulty, replace with a new ignition coil and reattach the connector.

4. Inspect and Replace Fuel Injector

• Sub-steps:
  1. Remove the fuel injector harness and fuel rail cover if needed.
  2. Check for electrical connection and listen for the injector operation.
  3. If the injector is faulty, remove it from the fuel rail using the appropriate tools.
  4. Install the new fuel injector, ensuring proper sealing and connection.

5. Check for Vacuum Leaks

• Sub-steps:
  1. Visually inspect all vacuum hoses connected to the intake manifold.
  2. Use a smoke machine or carburetor cleaner to identify any leaks.
  3. Replace any damaged hoses or seals as necessary.