how to fix P0302 misfire code in Ford F-150 14th Generation (2021-2024)

Solution

1. Preparation

• Gather tools: OBD-II scanner, socket set, torque wrench, compression tester, noid light, multimeter, and vacuum gauge.
• Disconnect the battery negative terminal to ensure safety.

2. Replace Spark Plug and Ignition Coil

• Remove Engine Cover (if applicable)
  • Use a socket set to remove any bolts securing the engine cover.
• Remove Ignition Coil
  • Unplug the electrical connector from the ignition coil of cylinder 2.
  • Remove the bolt securing the ignition coil and pull it out gently.
• Replace Spark Plug
  • Use a spark plug socket to remove the spark plug from cylinder 2.
  • Inspect the spark plug for signs of wear or fouling; replace if necessary.
  • Install the new spark plug, tightening to the manufacturer's specified torque (typically around 13-15 lb-ft).
• Install New Ignition Coil
  • Insert the new ignition coil into the spark plug hole and secure it with the bolt.
  • Reconnect the electrical connector.

3. Test Fuel Injector

• Inspect Fuel Injector
  • Use the noid light to check for proper electrical signal to the fuel injector on cylinder 2.
  • If no signal is present, inspect the wiring and connectors for damage.
• Replace Fuel Injector (if necessary)
  • Remove the fuel rail if required to access the injector.
  • Disconnect the fuel line and electrical connector from the injector.
  • Remove the old injector and install the new one, ensuring proper seating and sealing.

4. Perform Compression Test

• Insert the compression tester into the spark plug hole of cylinder 2.
• Crank the engine and note the compression reading.
• If the compression is low (below manufacturer specifications), further investigation is needed, such as checking the piston rings or valves.