how to diagnose the P0301 code in my Ford Explorer Sixth Generation (2020-present)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the battery to prevent electrical shorts.

2. Spark Plug Replacement

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the ignition coil from cylinder 1.
  • Unplug the electrical connector.
  • Remove the mounting bolts and lift the coil out.
• Remove the spark plug using a spark plug socket.
  • Inspect the old spark plug for wear or fouling.
  • Replace with a new spark plug, ensuring it has the correct gap.
  • Torque the spark plug to manufacturer specifications (usually around 13-15 lb-ft).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Ignition Coil Inspection/Replacement

• If the spark plug is intact, test or replace the ignition coil.
• Remove the coil and inspect for cracks or damage.
• If replacing, install the new coil and torque to specifications.

4. Fuel Injector Testing/Replacement

• If misfire continues, check the fuel injector for cylinder 1.
• Remove the injector and test it with a fuel pressure gauge or swap with another cylinder.
• If faulty, replace the injector and ensure it is properly seated.

5. Compression Test

• If previous steps do not solve the issue, perform a compression test.
• Remove all spark plugs and insert the compression tester into cylinder 1.
• Crank the engine and record the pressure; compare to manufacturer specifications.
• Low compression may indicate internal engine problems, requiring further investigation.