how to deal with P0301 code on my Ford Mustang S550 (2015-2023)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent electrical shorts.
• Ensure the vehicle is on a level surface and secure with wheel chocks.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, gap gauge, dielectric grease.
• Remove the ignition coil from cylinder 1 by unscrewing the retaining bolt.
• Carefully pull the ignition coil out, ensuring no debris falls into the cylinder.
• Remove the spark plug using a spark plug socket.
• Inspect the spark plug for wear, carbon buildup, or damage. If necessary, replace it with a new spark plug, ensuring the gap is set according to manufacturer specifications (typically 0.030-0.035 inches).
• Apply a small amount of dielectric grease to the ignition coil boot before reinstalling the coil.

3. Inspect and Replace Ignition Coil

• If the spark plug appears fine but misfire persists, test the ignition coil's resistance using a multimeter.
• If faulty, remove the coil and replace it with a new one, ensuring it is seated correctly.

4. Check and Clean or Replace Fuel Injector

• If ignition components are functioning correctly, check the fuel injector for cylinder 1.
• Remove the fuel injector connector and check resistance with a multimeter (should be in the range specified by the manufacturer).
• If faulty, remove the injector using a fuel injector puller tool and replace it. If it is cleanable, use an injector cleaning solution.

5. Verify Repair

• Reconnect the battery and clear the error codes using the OBD-II scanner.
• Start the engine and let it idle, checking for smooth operation without misfire.
• Perform a test drive to ensure the vehicle accelerates without issues and the check engine light does not reappear.