how to fix the P0301 code in my Ford Mustang S550 (2015-2023)?

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, compression tester, fuel pressure gauge.
• Disconnect the negative battery terminal to prevent electrical shorts. Allow the engine to cool.

2. Replace Spark Plug and Ignition Coil

1. Remove the engine cover if applicable.
2. Locate the ignition coil and spark plug for cylinder 1.
3. Disconnect the electrical connector from the ignition coil.
4. Remove the ignition coil by unscrewing it from the cylinder head.
5. Use a spark plug socket to remove the spark plug from cylinder 1.
6. Inspect the spark plug for fouling or damage; replace with a new spark plug if necessary (specification: OEM or equivalent).
7. Install the new spark plug and torque it to the manufacturer's specification (typically around 13-15 lb-ft).
8. Reinstall the ignition coil and reconnect the electrical connector. Torque the coil to specification (typically around 7-9 lb-ft).

3. Inspect and Clean Fuel Injector

1. Disconnect the fuel injector connector for cylinder 1.
2. Remove the fuel rail bolts and pull it back gently to access the injector.
3. Remove the fuel injector from the rail; inspect for dirt or clogs.
4. Clean the injector with a suitable cleaning solvent or replace it if necessary.
5. Reinstall the fuel injector and ensure it is properly seated.
6. Reattach the fuel rail and torque to specification.

4. Check for Vacuum Leaks

1. Inspect all vacuum lines connected to the intake manifold and throttle body.
2. Use a smoke machine or carb cleaner to check for leaks at the intake manifold gasket.
3. Repair or replace any damaged hoses or gaskets.

5. Perform Compression and Fuel Pressure Tests

1. For compression testing, remove the spark plug from cylinder 1, insert the compression tester, and crank the engine to record the pressure. Compare to specifications (typically around 150 psi).
2. For fuel pressure testing, connect the fuel pressure gauge to the service port on the fuel rail and turn the key to the "on" position without starting the engine to check the pressure (specification: typically 40-60 psi).