my Ford Mustang S650 (2024-Present) has a P0301 code what does it mean

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative battery terminal to prevent electrical shock.
• Allow the engine to cool before starting work.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, gap gauge.
• Remove the ignition coil from cylinder 1 by unscrewing the bolts and disconnecting the electrical connector.
• Remove the spark plug using a spark plug socket. Inspect for wear or damage.
• If necessary, replace with a new spark plug, ensuring it's gapped to the manufacturer's specifications (typically 0.030 inch for a Mustang).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Check and Replace Ignition Coil

• Tools Required: Socket set.
• If the spark plug is fine, test the ignition coil with a multimeter.
• Remove the ignition coil from cylinder 1 and swap it with another cylinder to see if the misfire follows.
• If the misfire moves, replace the faulty ignition coil with a new one.

4. Inspect Fuel Injector

• Tools Required: Fuel injector cleaning kit or multimeter.
• Disconnect the fuel injector electrical connector and test its resistance with a multimeter.
• If it’s out of specifications, replace the fuel injector for cylinder 1.
• Reconnect the fuel injector and ensure it is securely seated.

5. Perform Compression Test

• Tools Required: Compression gauge.
• Remove the spark plug for cylinder 1.
• Insert the compression gauge into the spark plug hole and crank the engine.
• Note the compression reading, and compare it to manufacturer specifications. If low, an internal engine issue may exist.

6. Reassemble and Finalize

• Reconnect any components removed during the inspection or replacement process.
• Reconnect the negative battery terminal.
• Start the engine and observe for any check engine light reactivation.