how to fix P0301 misfire code in Ford F-150 14th Generation (2021-2024)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.
• Ensure the engine is cool before starting work.

2. Inspect and Replace Spark Plug

• Sub-steps:
  1. Remove the engine cover if applicable.
  2. Disconnect the ignition coil connector on cylinder number one.
  3. Remove the ignition coil using a socket set.
  4. Using a spark plug socket, remove the spark plug from cylinder number one.
  5. Inspect the spark plug for signs of wear or fouling. Replace with a new spark plug if necessary (consult vehicle specifications for the correct type).
  6. Reinstall the spark plug and torque to the manufacturer's specifications (usually around 13-15 lb-ft).
  7. Reinstall the ignition coil and reconnect the connector.

3. Check and Replace Ignition Coil (if necessary)

• Sub-steps:
  1. If the ignition coil is suspected to be faulty, remove it as per previous steps.
  2. Test the ignition coil using a multimeter (check resistance against manufacturer specifications).
  3. If faulty, replace with a new ignition coil.
  4. Reinstall the ignition coil and reconnect the connector.

4. Inspect Fuel Injector

• Sub-steps:
  1. Remove the fuel rail cover if applicable.
  2. Disconnect the fuel injector connector for cylinder number one.
  3. Use a multimeter to test the injector resistance (should be within manufacturer specifications).
  4. If the injector is clogged or faulty, replace it with a new fuel injector.
  5. Reconnect the fuel injector and ensure proper sealing.

5. Perform Compression Test

• Sub-steps:
  1. Remove the spark plug from cylinder number one.
  2. Insert a compression tester into the spark plug hole.
  3. Crank the engine for a few seconds and record the pressure reading.
  4. If compression is below specifications, further engine diagnosis may be required.