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

Solution

1. Preparation

• Gather tools and materials required for the repair.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool if it has been running.

2. Inspect and Replace Spark Plug

• Sub-steps:
  1. Remove the engine cover if applicable.
  2. Disconnect the ignition coil connector from the cylinder 1 ignition coil.
  3. Remove the ignition coil from cylinder 1 using a socket set (typically 8mm or 10mm).
  4. Remove the spark plug using a spark plug socket and ratchet.
  5. Inspect the spark plug for signs of wear or damage (e.g., fouling, excessive gap).
  6. If damaged, replace the spark plug with a new one of the correct specification (usually Motorcraft SP-534 or equivalent).

3. Inspect and Replace Ignition Coil

• Sub-steps:
  1. If the spark plug is in good condition, inspect the ignition coil for cracks or other damage.
  2. If necessary, replace the ignition coil with a new one (preferably OEM).
  3. Reinstall the ignition coil and reconnect the connector securely.

4. Inspect and Replace Fuel Injector

• Sub-steps:
  1. Disconnect the fuel injector connector on cylinder 1.
  2. Remove the fuel rail if necessary to access the injector.
  3. Remove the fuel injector from cylinder 1 carefully.
  4. Inspect the injector for clogs or damage; replace if needed with a new injector (OEM recommended).
  5. Reinstall the fuel injector, and ensure the O-ring is properly seated.

5. Final Reassembly

• Sub-steps:
  1. Reconnect all connectors and verify they are secure.
  2. Reinstall any components or covers that were removed during the process.
  3. Reconnect the negative battery terminal.