how to fix P0301 misfire code in Ford Explorer Fifth Generation (2011-2019)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool completely.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket, dielectric grease.
• Remove the ignition coil by unscrewing the retaining bolts and disconnecting the electrical connector.
• Carefully remove the spark plug using the spark plug socket.
• Inspect the old spark plug for wear; replace it with a new spark plug (gap to specifications).
• Apply a small amount of dielectric grease to the ignition coil boot.
• Reinstall the spark plug and torque it to the manufacturer’s specifications (typically around 13 lb-ft).

3. Inspect or Replace Ignition Coil

• If the spark plug replacement did not resolve the issue, check the ignition coil.
• Tools Required: Socket set, multimeter (if testing).
• Swap the ignition coil from cylinder 1 with another cylinder.
• Clear the codes and run the engine to see if the misfire follows the coil. If it does, replace the ignition coil with a new one.

4. Check Fuel Injector

• If the misfire persists, check the fuel injector operation.
• Tools Required: Fuel injector tester or multimeter.
• Disconnect the fuel injector connector and test for proper voltage and resistance.
• If faulty, replace the fuel injector and ensure proper seating and connection.

5. Compression Test

• If all else fails, perform a compression test on cylinder 1.
• Tools Required: Compression tester.
• Remove the spark plug and insert the compression tester into the spark plug hole.
• Crank the engine and record the compression reading; it should be within the manufacturer’s specifications (usually 150-200 psi).
• If low, further investigation into valve or head gasket issues may be necessary.