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

Solution

1. Preparation

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

2. Replace Spark Plug

• Tools Required: Socket set, spark plug socket, torque wrench, gap gauge.
• Remove the ignition coil for cylinder 1 by unbolting it and disconnecting the electrical connector.
• Remove the spark plug using the spark plug socket.
• Inspect the spark plug gap using a gap gauge; adjust if necessary or replace with a new spark plug.
• Install the new spark plug, tightening it to the manufacturer’s specified torque (usually around 13-15 lb-ft).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Replace Ignition Coil (if needed)

• Tools Required: Socket set.
• If the ignition coil is found to be faulty during inspection, remove the old coil and install a new one.
• Ensure the new coil is compatible with the Mustang S550.
• Reconnect the electrical connector to the ignition coil.

4. Clean or Replace Fuel Injector (if needed)

• Tools Required: Fuel injector cleaning kit or replacement injector.
• Remove the fuel rail to access the injector for cylinder 1.
• If cleaning, follow the injector cleaning kit instructions. If replacing, install the new injector ensuring a proper seal.
• Reassemble the fuel rail and reconnect all hoses.

5. Perform Compression Test (if needed)

• Tools Required: Compression tester.
• Remove the spark plug and insert the compression tester into the cylinder.
• Crank the engine and record the compression reading. Compare with manufacturer specifications.
• If compression is low, further inspection of the cylinder and valves may be necessary.