how to diagnose P0301 misfire code in Ford Mustang S650 (2024-Present)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Replace Spark Plug

• Remove the ignition coil from cylinder 1:
  • Unplug the electrical connector from the ignition coil.
  • Remove the mounting bolts using a socket set.
• Remove the spark plug:
  • Use a spark plug socket to unscrew and remove the spark plug.
• Install the new spark plug:
  • Gap the new spark plug to the manufacturer's specifications.
  • Apply anti-seize compound on the threads if recommended.
  • Install the new spark plug and torque to the specified value (typically 13-15 lb-ft).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Replace Ignition Coil (if faulty)

• If the ignition coil failed the resistance test, replace it:
  • Install the new ignition coil in cylinder 1, ensuring it is seated properly.
  • Reconnect the electrical connector.

4. Check Fuel Injector (if necessary)

• If the fuel injector was found to be faulty, replace it:
  • Disconnect the electrical connector and fuel line from the injector.
  • Remove the injector from the intake manifold.
  • Install the new fuel injector and reconnect the fuel line and electrical connector.

5. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0301 code from the vehicle's computer.