how to diagnose P0301 code on 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 battery.

2. Inspect and Replace Spark Plug

• Sub-steps:
  1. Remove the engine cover (if applicable) using a socket set.
  2. Remove the ignition coil for cylinder 1 by unbolting it and disconnecting the electrical connector.
  3. Unscrew and remove the spark plug using a spark plug socket and ratchet.
  4. Inspect the spark plug; if worn or damaged, replace it with a new one (ensure correct gap).
  5. Reinstall the spark plug and torque to the manufacturer’s specification (usually around 13-15 lb-ft).
  6. Reinstall the ignition coil and reconnect the electrical connector.

3. Check and Replace Ignition Coil

• Sub-steps:
  1. If the spark plug was fine, test the ignition coil with a multimeter for resistance.
  2. If out of spec, replace the ignition coil with a new one.
  3. Follow the same steps as above to remove and install the ignition coil.

4. Inspect Fuel Injector

• Sub-steps:
  1. Remove the fuel rail (if necessary) to access the fuel injector for cylinder 1.
  2. Check for clogs or malfunction; clean or replace the fuel injector if needed.
  3. Reinstall the fuel rail and ensure all connections are secure.

5. Compression Test

• Sub-steps:
  1. Remove the spark plug again.
  2. Insert the compression gauge into the spark plug hole.
  3. Crank the engine and record the compression reading.
  4. If the compression is low, further investigation is required for potential internal engine issues.

Tools Required:

• OBD-II scanner
• Socket set
• Spark plug socket
• Ratchet
• Multimeter
• Compression gauge

Parts Required:

• Spark plug for cylinder 1
• Ignition coil for cylinder 1
• Fuel injector (if needed)

Estimated Repair Time: 2-4 hours

Safety Warnings:

• Disconnect battery before working on electrical systems.
• Allow engine to cool before removing components.