how to fix P0300 code on Ford F-150 Fourteenth Generation (2021-present)

Learn how to diagnose and fix P0300 engine misfire in Ford F-150. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the negative battery terminal.
• Allow the engine to cool before beginning repairs.

2. Inspect and Replace Spark Plugs

• Remove the engine cover if applicable.
• Use a socket set to remove the spark plugs.
• Inspect the spark plugs for fouling or wear (replace if necessary).
• Install new spark plugs, ensuring the correct gap as specified by manufacturer guidelines.
• Torque to the manufacturer's specifications (typically around 13-15 lb-ft).

3. Inspect and Replace Ignition Coils

• Disconnect the electrical connectors from the ignition coils.
• Remove the ignition coil bolts with a socket set.
• Replace any faulty ignition coils with new ones.
• Reconnect electrical connectors, ensuring a secure fit.

4. Fuel System Check

• Connect a fuel pressure gauge to the fuel rail.
• Turn the ignition to the "on" position (do not start) to check fuel pressure.
• If pressure is below specifications, check the fuel pump and filter for issues, replacing as necessary.

5. Vacuum Leak Inspection

• With the engine running, use a smoke machine or spray soapy water on vacuum hoses to identify leaks.
• Replace any damaged or cracked vacuum hoses.

6. Reassemble and Reconnect

• Reinstall any components removed for access.
• Reconnect the negative battery terminal.
• Start the engine and check for any remaining issues.