my Ford Mustang S650 (2024-Present) has a check engine light with P0300 code

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the vehicle's battery to ensure safety.

Tools Required:

• OBD-II scanner
• Socket set
• Torque wrench
• Compression gauge
• Multimeter
• Fuel injector cleaner

2. Inspect and Replace Spark Plugs

1. Remove the engine cover (if applicable) using a socket set.
2. Disconnect the ignition coils from the spark plugs.
3. Remove the spark plugs using a spark plug socket.
4. Inspect each spark plug for wear or fouling; replace if necessary.
5. Install new spark plugs, ensuring they are gapped according to manufacturer specifications (check owner's manual for the correct gap).
6. Reconnect the ignition coils.

3. Inspect Ignition Coils

1. Test each ignition coil with a multimeter for resistance (consult the service manual for specifications).
2. Replace any faulty ignition coils with new units.
3. Reassemble any components removed during inspection.

4. Clean or Replace Fuel Injectors

1. If injectors are dirty, use a fuel injector cleaning kit to clean them according to the kit instructions.
2. If injectors are faulty, remove them using a socket set and replace with new ones.
3. Reconnect fuel lines and ensure there are no leaks.

5. Perform Compression Test (if necessary)

1. Remove the spark plugs again to access the cylinders.
2. Insert the compression gauge into the spark plug hole of each cylinder.
3. Crank the engine and record the compression readings. Compare to manufacturer specifications.
4. Address any cylinders with low compression (possible head gasket or internal engine issues).