how to fix P0302 misfire code in Ford F-150 Fourteenth Generation (2021-present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface, and the engine is cool.
• Disconnect the battery to prevent electrical shorts.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the ignition coil:
  • Disconnect the electrical connector on the ignition coil.
  • Remove the bolts securing the coil to the cylinder head.
  • Gently pull the coil out of the spark plug well.
• Remove the spark plug:
  • Use the spark plug socket to unscrew and remove the old spark plug.
• Install the new spark plug:
  • Apply anti-seize compound to the threads of the new spark plug (if recommended).
  • Hand-tighten the spark plug, then use a torque wrench to tighten it 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 needed)

• Tools Required: Socket set.
• Remove the ignition coil from cylinder 2 as described above.
• Test the ignition coil with a multimeter for resistance (consult service manual for specifications).
• If out of spec, replace with a new ignition coil and reinstall as per the previous steps.

4. Inspect Fuel Injector

• Tools Required: Noid light or multimeter, fuel injector cleaner (if applicable).
• Disconnect the fuel injector connector for cylinder 2.
• Use a noid light to check for proper signal; if not flashing, investigate wiring or ECU issues.
• If the injector is faulty, replace it:
  • Remove the fuel rail if necessary, and replace the injector.
  • Reconnect the fuel line and electrical connector.

5. Verify Compression

• Tools Required: Compression tester.
• Remove spark plugs from all cylinders for accurate testing.
• Insert the compression tester into cylinder 2 and crank the engine.
• Compare the reading with manufacturer specifications. If low, further investigation of cylinder head, valves, or piston rings may be needed.