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

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the battery to avoid electrical shorts.
• Allow the engine to cool down.

2. Inspect and Replace Spark Plug

1. Remove the engine cover if necessary.
2. Use a socket wrench to remove the spark plug from cylinder 1.
   • Tool Required: Spark plug socket, ratchet, and extension.
3. Inspect the spark plug for signs of damage or fouling.
4. If necessary, replace with a new spark plug that meets OEM specifications.
   • Torque the new spark plug to the manufacturer's specification (typically around 13-15 ft-lbs).
5. Reinstall the spark plug and engine cover.

3. Check and Replace Ignition Coil

1. Remove the ignition coil from cylinder 1.
   • Tool Required: Socket set.
2. Inspect the coil for cracks or carbon tracking.
3. If damage is found, replace the ignition coil with a new one.
4. Reinstall the ignition coil ensuring it clicks into place.

4. Inspect and Clean Fuel Injector

1. Disconnect the fuel injector connector.
2. Carefully remove the fuel injector from cylinder 1.
   • Tool Required: Fuel injector puller (if necessary).
3. Inspect the injector for clogs or debris.
4. Clean or replace the injector as needed.
5. Reinstall the fuel injector and reconnect the wiring harness.

5. Perform Compression Test

1. Remove the spark plug from cylinder 1 again.
2. Insert a compression gauge into the spark plug hole.
3. Crank the engine and record the compression reading.
4. Compare the reading to the manufacturer's specifications.
5. If the compression is low, further investigation into internal engine components may be necessary.