how to fix P0301 code misfire on Ford Mustang S550 (2015-2023)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative terminal of the battery to ensure safety.
• Allow the engine to cool down before starting the repair.

2. Inspect and Replace Spark Plug

• Remove the ignition coil for cylinder 1:
  • Unscrew the bolts securing the coil.
  • Gently pull the coil out of the spark plug hole.
• Remove the spark plug using a spark plug socket:
  • Turn counterclockwise to unscrew.
• Inspect the spark plug for wear, carbon build-up, or damage. Replace with a new spark plug if necessary:
  • Check gap specifications and adjust if needed.
  • Install the new spark plug by threading it in by hand, then torque it to the manufacturer's specification (typically around 13 lb-ft).
• Reinstall the ignition coil and secure it with bolts.

3. Inspect and Replace Ignition Coil

• If the ignition coil appears damaged or faulty, replace it:
  • Disconnect the electrical connector.
  • Remove the coil mounting bolts.
  • Install the new ignition coil by reversing the removal steps and ensuring it is securely fastened.

4. Clean or Replace Fuel Injector

• If a fuel injector issue is suspected:
  • Disconnect the fuel injector electrical connector.
  • Remove fuel injector retaining clips and pull the injector out.
  • Clean the injector using a specialized cleaner or replace it with a new one.
  • Reinstall the injector and securing clips.

5. Reconnect Battery and Clear Codes

• Reconnect the negative terminal of the battery.
• Use the OBD-II scanner to clear the P0301 code and perform a test drive to verify repairs.