how to diagnose P0301 engine code on Ford F-150 14th Generation (2021-2024)

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.

2. Inspect and Replace Ignition Components

• Spark Plug Replacement

  • Remove the ignition coil from cylinder 1 using a socket set.
  • Remove the spark plug using a spark plug socket.
  • Inspect the old spark plug for wear; replace with a new spark plug as per manufacturer specifications (e.g., gap setting).

• Ignition Coil Replacement

  • If the coil appears damaged or has high resistance, replace it with a new coil compatible with the F-150.

3. Test and Replace Fuel Injector

• Connect a noid light to the fuel injector connector for cylinder 1 to check for signal.
• If no signal is present, further inspect wiring; if the injector is not functioning, remove and replace it.
• Follow the manufacturer’s specifications for torque settings when reinstalling the injector.

4. Compression Test

• Reconnect the battery and perform a compression test on cylinder 1.
• If compression is below the recommended specifications, further investigation into mechanical issues (like a valve or piston) may be needed.

5. Inspect for Vacuum Leaks

• Use a smoke machine or carburetor cleaner to check for vacuum leaks around the intake manifold and throttle body.
• Repair any identified leaks to ensure proper air-fuel mixture.