how to fix P0301 misfire code on Ford Mustang S650 (2024-Present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal for safety.
• Allow the engine to cool down before starting work.

2. Replace Spark Plug

• Remove the engine cover if applicable.
• Using a socket set, remove the spark plug wire or coil pack from cylinder 1.
• Use a spark plug socket to remove the old spark plug. Inspect for wear or damage.
• Install a new spark plug, ensuring it is gapped correctly per manufacturer specifications (typically 0.030 inches for Mustang).
• Torque the spark plug to the manufacturer’s specification (usually around 13 lb-ft).

3. Inspect and Replace Ignition Coil

• If the spark plug replacement does not resolve the issue, remove the ignition coil from cylinder 1.
• Inspect the ignition coil for signs of wear or damage.
• Replace with a new ignition coil if necessary.
• Reinstall the ignition coil and ensure it is securely connected.

4. Check Fuel Injector

• Disconnect the fuel injector connector for cylinder 1.
• Use a noid light to check for proper pulse at the injector while cranking the engine.
• If no pulse is detected, check the wiring and replace the injector if it is malfunctioning.

5. Conduct Compression Test

• Remove the spark plug from cylinder 1.
• Insert a compression gauge into the spark plug hole.
• Crank the engine a few times to obtain a reading.
• Compare the reading against the manufacturer's specifications (usually around 150 psi). If low, further investigation is needed for internal engine issues.