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

• Tools Required: OBD-II scanner, socket set, multimeter, compression tester, vacuum gauge.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative terminal of the battery.

2. Inspect and Replace Spark Plugs

• Remove the ignition coil cover if applicable.
• Use a socket to remove each spark plug.
• Inspect the spark plugs for signs of wear, carbon buildup, or damage.
• Install new spark plugs with the appropriate gap as specified by the manufacturer (typically 0.050 inches for F-150).
• Torque the spark plugs to the manufacturer’s specification (usually around 13 lb-ft).

3. Test and Replace Ignition Coils

• Using a multimeter, check the resistance of each ignition coil.
• If any coils are out of specification, remove them using a socket and replace with new coils.
• Reinstall the ignition coils and ensure they are seated properly.

4. Inspect and Test Fuel Injectors

• Remove the fuel injector connectors and check for continuity with a multimeter.
• Perform a fuel pressure test to ensure the fuel system delivers adequate pressure (typically 30-45 psi for F-150).
• Replace any faulty fuel injectors.

5. Check for Vacuum Leaks

• Use a vacuum gauge to check for proper vacuum levels (should be around 18-22 inHg at idle).
• Inspect all vacuum lines and the intake manifold for leaks.
• Repair or replace any damaged hoses or gaskets.

6. Check Engine Compression

• Remove all spark plugs and insert a compression tester into each cylinder.
• Crank the engine and record the compression readings; they should be within manufacturer specifications (usually 100-140 psi).
• Address any cylinders with significantly lower compression by inspecting rings, valves, or gaskets.