how to fix P0301 misfire code on Ford F-150 Fourteenth Generation (2021-present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool before starting work.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the ignition coil from cylinder 1 by unbolting it and disconnecting the electrical connector.
• Remove the spark plug using the spark plug socket.
• Inspect the spark plug for wear; replace it with a new one if necessary.
• Install the new spark plug, tightening to the manufacturer’s specified torque (typically around 13 lb-ft).
• Reattach the ignition coil ensuring it is seated correctly.

3. Inspect and Replace Ignition Coil

• If the spark plug was not the issue, remove the ignition coil from cylinder 1.
• Test the ignition coil with a multimeter to check for proper resistance (usually around 0.5-1.5 ohms).
• If faulty, replace the ignition coil with a new one.
• Reconnect the electrical connector and secure it in place.

4. Check Fuel Injector

• Disconnect the fuel injector from cylinder 1 and inspect for clogs or damage.
• Use a noid light to check for proper electrical signal to the fuel injector.
• If the injector is faulty, replace it with a new one.
• Reconnect the injector and ensure it is properly seated.

5. Verification of Repairs

• Reconnect the negative battery terminal.
• Start the engine and let it idle, observing for smooth operation.
• Use the OBD-II scanner to clear the P0301 code and test drive the vehicle.
• Monitor for any reoccurrence of the check engine light or misfire symptoms.