how to fix P0300 code on my Ford F-150 13th Generation (2015-2020)

Learn how to diagnose and fix P0300 random/multiple cylinder misfire in Ford F-150 (2015-2020). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery cable to prevent electrical shock.
• Allow the engine to cool down before starting work.

2. Inspect and Replace Spark Plugs

• Tools Required: Socket set, torque wrench.
• Remove the engine cover if applicable.
• Disconnect the ignition coils from the spark plugs.
• Use the socket set to remove the spark plugs.
• Inspect spark plugs for signs of wear or fouling; replace as necessary.
• Torque new spark plugs to the manufacturer’s specifications (typically around 13-15 lb-ft).
• Reconnect the ignition coils.

3. Inspect and Replace Ignition Coils

• Remove the ignition coils from the spark plugs.
• Test each ignition coil with a multimeter to ensure they are within the specified resistance range.
• Replace any faulty ignition coils with new ones.
• Reinstall ignition coils and reconnect electrical connectors.

4. Fuel System Inspection

• Tools Required: Fuel pressure gauge.
• Connect the fuel pressure gauge to the fuel rail.
• Turn the ignition to the "ON" position (do not start) and check fuel pressure against the manufacturer’s specifications.
• If pressure is low, check the fuel pump and filter.
• Replace the fuel filter if necessary and consider replacing the fuel pump if it fails the pressure test.

5. Check Engine Compression

• Tools Required: Compression tester.
• Remove the spark plugs for better access.
• Insert the compression tester into each cylinder and crank the engine.
• Record the compression readings for each cylinder and compare to manufacturer specifications (generally around 125-175 psi).
• If readings are low, further diagnostics may be needed for valve or piston issues.