my Ford Mustang S650 (2024-Present) has a check engine light and code P0301

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.

Tools Required:

• OBD-II scanner
• Socket set
• Torque wrench
• Compression tester
• Multimeter
• Noid light

2. Inspect and Replace Ignition Coil

1. Locate the ignition coil for cylinder 1 (consult service manual for location).
2. Remove the bolt(s) securing the ignition coil using a socket.
3. Disconnect the electrical connector from the ignition coil.
4. Remove the ignition coil from the spark plug.
5. Install a new ignition coil by reversing the removal steps.
6. Reconnect the electrical connector and secure with bolts.

3. Inspect and Replace Spark Plug

1. Remove the ignition coil as outlined above.
2. Use a spark plug socket to remove the spark plug from cylinder 1.
3. Inspect the spark plug for wear or carbon buildup.
4. If necessary, install a new spark plug with the correct gap (consult service manual for specifications).
5. Torque the spark plug to the manufacturer's specification (typically around 13-15 lb-ft).
6. Reinstall the ignition coil.

4. Compression Test

1. Remove the spark plug from cylinder 1.
2. Insert the compression tester into the spark plug hole.
3. Crank the engine for a few seconds and record the compression reading.
4. Compare the reading with manufacturer specifications (typically around 150-200 psi).
5. If the compression is low, further investigation is needed for potential internal engine issues.

5. Test Fuel Injector

1. Locate the fuel injector for cylinder 1.
2. Disconnect the electrical connector from the fuel injector.
3. Use a noid light to check for a signal when cranking the engine. If there is no signal, check wiring and ECM.
4. If the injector is faulty, remove and replace it.
5. Reconnect the electrical connector and secure any fasteners.