how to fix P0300 code on my Ford Mustang S650 (2024-Present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Replace Spark Plugs

• Remove the ignition coil using a socket set.
• Unscrew and remove the spark plug with a spark plug socket.
• Inspect the old spark plug and replace it if worn or damaged.
• Install the new spark plug, torquing to manufacturer specifications (typically around 13-15 lb-ft).
• Reinstall the ignition coil.

3. Test and Replace Ignition Coils (if necessary)

• Test each ignition coil with a multimeter; consult the repair manual for resistance specifications.
• If a coil is faulty, remove it as described above and replace it with a new one, ensuring proper connection.

4. Inspect and Clean Fuel Injectors

• Remove the fuel rail assembly if necessary to access the injectors.
• Use an injector cleaner or replace any clogged or malfunctioning injectors.
• Reinstall the fuel rail and ensure all connections are secure.

5. Check for Vacuum Leaks

• Visually inspect all vacuum lines for cracks or disconnections.
• Use a smoke test or carburetor cleaner spray around suspected areas while the engine is running to identify leaks.
• Replace any damaged vacuum hoses.

6. Perform Compression Test

• Remove spark plugs and use a compression tester on each cylinder.
• Compare the readings to manufacturer specifications (typically around 120-180 psi).
• Address any cylinders with low compression through further diagnostics or repairs.