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

Solution

1. Preparation

• Gather tools and materials needed for repairs.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the ignition coil from cylinder 1 by unscrewing the retaining bolts and disconnecting the electrical connector.
• Remove the old spark plug using the spark plug socket.
• Inspect the spark plug for signs of wear, fouling, or damage. Replace if necessary.
• Install the new spark plug, hand-tighten, and then torque to the manufacturer's specification (typically around 13-15 lb-ft).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Check and Replace Ignition Coil

• If the ignition coil is suspected faulty, remove it from cylinder 1 after disconnecting it as outlined above.
• Swap the ignition coil with another cylinder to test if the misfire code moves to that cylinder.
• If it does, replace the ignition coil with a new one.
• Reconnect all components after replacement.

4. Inspect and Clean Fuel Injector

• If the injector is suspected of malfunction, remove the fuel rail to access the injector for cylinder 1.
• Use a fuel injector cleaner or replace the injector if it is clogged or defective.
• Reinstall the fuel rail and ensure all connections are secure.

5. Perform Compression Test

• If misfire persists, perform a compression test on cylinder 1.
• Remove the spark plug and insert the compression gauge.
• Crank the engine and record the compression readings. Compare to specifications (usually 100-200 PSI).
• If compression is low, further investigation into piston rings or valves may be needed.