why does my Ford Mustang S650 (2024-Present) have a check engine light with code P0300

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool if it has been recently running.

2. Inspect Spark Plugs

• Remove the ignition coils using a socket set.
• Take out the spark plugs with a spark plug socket.
• Inspect each spark plug for wear, carbon buildup, or damage. Replace as necessary.
• Torque the new spark plugs to the manufacturer's specification (typically around 13-15 lb-ft).

3. Test Ignition Coils

• Use a multimeter to test the resistance of each ignition coil according to manufacturer specifications (usually around 0.5-1.5 ohms).
• Replace any faulty ignition coils with OEM parts.
• Reinstall the ignition coils.

4. Fuel System Inspection

• Connect a fuel pressure gauge to the fuel rail and check pressure against the manufacturer's specifications.
• If pressure is low, inspect the fuel pump and replace if necessary.
• Clean or replace any malfunctioning fuel injectors.

5. Vacuum Leak Check

• Start the engine and listen for hissing sounds that indicate vacuum leaks.
• Use smoke testing if necessary to find leaks in vacuum lines and gaskets.
• Repair or replace any damaged vacuum lines or gaskets.