my Ford Mustang S550 (2015-2023) has a check engine light with code P0301, how to fix it

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative terminal of the battery to prevent electrical shock.

2. Inspect and Replace Spark Plug

1. Remove the engine cover if applicable.
2. Locate the spark plug for cylinder 1 (refer to the vehicle’s service manual for its exact location).
3. Use a spark plug socket and ratchet to remove the spark plug.
4. Inspect the spark plug for wear or fouling. If damaged, replace it with a new one (specify the correct type as per manufacturer specifications).
5. Torque the new spark plug to manufacturer specifications, typically around 13-15 lb-ft (consult the service manual).

3. Inspect and Replace Ignition Coil

1. Disconnect the electrical connector from the ignition coil for cylinder 1.
2. Remove the ignition coil bolt using the appropriate socket.
3. Carefully pull the ignition coil out of the spark plug well.
4. Inspect the ignition coil for signs of damage. Replace with a new coil if necessary.
5. Reinstall the ignition coil and torque the bolt to manufacturer specifications, usually around 10-12 lb-ft.

4. Check Fuel Injector

1. Locate the fuel injector for cylinder 1.
2. Disconnect the electrical connector from the fuel injector.
3. Remove the fuel injector retention clip and pull the injector out.
4. Inspect the injector for clogs or leaks. Replace it if it appears damaged or malfunctioning.
5. Reinstall the new or cleaned injector, ensuring it seats properly and reconnect the electrical connector.

5. Final Assembly

• Reconnect the negative terminal of the battery.
• Reinstall any engine covers that were removed.
• Start the engine and allow it to idle, checking for any irregularities.