how to fix P0301 code in my Ford F-150 Fourteenth Generation (2021-present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, dielectric grease.
• Remove the ignition coil from cylinder 1:
  • Unplug the electrical connector.
  • Remove the mounting bolts and lift the coil out.
• Remove the spark plug using a spark plug socket:
  • Inspect the spark plug for wear or carbon buildup.
  • Replace with a new spark plug if necessary, ensuring it is gapped correctly to manufacturer specifications.
• Apply a small amount of dielectric grease to the inside of the ignition coil boot before reinstalling.

3. Check and Replace Ignition Coil (if needed)

• If the spark plug is fine but the misfire persists, test the ignition coil:
  • Swap the ignition coil from cylinder 1 with another cylinder.
  • Clear the codes and start the engine to see if the P0301 code returns to cylinder 1.
• If it does, replace the ignition coil with a new one.

4. Inspect Fuel Injector

• Tools Required: Fuel pressure gauge, injector cleaning kit.
• Disconnect the fuel injector connector for cylinder 1.
• Use a fuel pressure gauge to check the fuel pressure; it should meet manufacturer specifications.
• If pressure is low, check the fuel pump and filter. If pressure is correct, clean or replace the fuel injector as needed.

5. Compression Test

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 1.
• Insert the compression tester and crank the engine to measure compression.
• If compression is low, further investigation into the internal engine components may be necessary.