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

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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to prevent electrical shocks.
• Allow the engine to cool before starting work.

2. Replace Spark Plugs

1. Remove engine cover if necessary to access spark plugs.
2. Use a spark plug socket to remove the old spark plugs.
3. Check and set the gap on the new spark plugs according to manufacturer specifications.
4. Install the new spark plugs and torque them to the manufacturer’s specifications (typically around 13-15 lb-ft).
5. Reattach any components removed during this process.

3. Inspect and Replace Ignition Coils

1. Remove the ignition coil connectors.
2. Unscrew the ignition coils from their mounting.
3. Inspect for cracks or damage; replace any faulty coils with new ones.
4. Reinstall ignition coils and securely fasten them with screws.
5. Reconnect the ignition coil connectors.

4. Check Fuel Injectors

1. Remove the fuel rail cover to access the fuel injectors.
2. Disconnect the fuel injector connectors.
3. Use a multimeter to check for proper resistance in each injector.
4. Replace any malfunctioning injectors.
5. Reconnect fuel injector connectors and reinstall the fuel rail cover.

5. Inspect for Vacuum Leaks

1. Start the engine and listen for hissing sounds that indicate vacuum leaks.
2. Spray a small amount of carburetor cleaner around intake gaskets and hoses to identify leaks (engine RPM will change if a leak is present).
3. Replace any damaged hoses or gaskets found during inspection.

6. Test Engine Compression (if needed)

1. Remove all spark plugs for easier access to the cylinders.
2. Insert a compression tester into the spark plug holes.
3. Crank the engine and record the compression readings for each cylinder.
4. Compare the readings to manufacturer specifications; replace the engine if compression is low.