how to fix P0301 misfire code on my Ford F-150 13th Generation (2015-2020)

Solution

1. Preparation

• Gather necessary tools and parts.
• 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

1. Remove the engine cover if applicable.
2. Remove the ignition coil from cylinder 1:
   • Disconnect the electrical connector.
   • Unbolt the coil using a socket set.
3. Remove the spark plug using a spark plug socket and ratchet.
4. Inspect the old spark plug for wear or deposits. Replace if necessary:
   • Ensure the gap is set to manufacturer specifications (typically 0.028-0.031 inches for Ford).
5. Install the new spark plug and torque it to 13 lb-ft.
6. Reinstall the ignition coil and reconnect the electrical connector.

3. Check and Replace Ignition Coil (if necessary)

1. If the spark plug inspection shows no issues, test the ignition coil:
   • Swap the ignition coil from cylinder 1 with another cylinder (e.g., cylinder 2).
   • Clear the P0301 code and drive the vehicle to see if the misfire moves to the new cylinder.
2. If the misfire follows the ignition coil, replace it:
   • Disconnect the electrical connector and unbolt the coil.
   • Install the new ignition coil and reconnect the electrical connector.

4. Inspect Fuel Injector (if necessary)

1. If the misfire persists after replacing the spark plug and ignition coil, check the fuel injector:
   • Disconnect the wiring harness from the fuel injector on cylinder 1.
   • Use a multimeter to test for proper resistance (typically 12-16 ohms).
2. If the injector is faulty, replace it:
   • Remove the fuel rail if necessary to access the injector.
   • Install a new fuel injector and ensure proper seating.

5. Verify Compression (if necessary)

1. If all else fails, perform a compression test on cylinder 1:
   • Remove the spark plug and insert a compression tester.
   • Crank the engine and record the pressure.
2. If compression is below manufacturer specifications (typically around 120 psi), further investigation is needed for possible internal engine issues.