how to diagnose P0301 code in my Ford F-150 14th Generation (2021-2024)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shock.
• Allow the engine to cool down before starting work.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket, dielectric grease.
• Remove the ignition coil from cylinder 1 by unscrewing the retaining bolts.
• Pull the ignition coil straight out, taking care not to damage the connector.
• Remove the spark plug using the spark plug socket.
• Inspect the spark plug for wear, carbon buildup, or damage. Replace if necessary.
• Apply a small amount of dielectric grease to the threads of the new spark plug.
• Install the new spark plug and torque it to the manufacturer’s specifications (typically around 13-15 lb-ft).
• Reinstall the ignition coil and secure it with the retaining bolts.

3. Check and Replace Ignition Coil

• Tools Required: Socket set, torque wrench.
• If the spark plug was in good condition, visually inspect the ignition coil for any cracks or signs of arcing.
• Replace the ignition coil if damaged or if the misfire persists after spark plug replacement.
• Torque the ignition coil bolts to the manufacturer's specifications.

4. Fuel Injector Testing

• Tools Required: Fuel pressure gauge, multimeter.
• Disconnect the fuel injector connector for cylinder 1.
• Use a multimeter to check for resistance across the injector terminals; compare with specifications (typically 12-16 ohms for most injectors).
• If the injector is faulty, replace it. Ensure proper installation by reconnecting the wiring securely.

5. Compression Test (if necessary)

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 1.
• Insert the compression tester into the spark plug hole and crank the engine.
• Compare the compression reading to the manufacturer's specifications (usually around 120-160 psi).
• Low compression may indicate an internal engine issue, requiring further inspection.