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

Solution

1. Preparation

• Tools Required: OBD-II scanner, compression tester, multimeter, basic hand tools.
• Disconnect the negative battery terminal to ensure safety.

2. Inspect and Replace Spark Plug

• Remove the ignition coil from cylinder 2.
  • Sub-steps: Unplug the electrical connector and remove mounting bolts.
• Remove the spark plug from cylinder 2 using a spark plug socket.
  • Sub-steps: Inspect the spark plug for wear or fouling; replace if necessary with OEM specifications.
• Reinstall the spark plug and ignition coil, ensuring proper torque (typically 13-15 lb-ft for spark plugs).

3. Check and Replace Ignition Coil

• If the spark plug is in good condition, inspect the ignition coil.
  • Sub-steps: Use a multimeter to test the primary and secondary resistance of the coil; replace if readings are out of specification.
• Install a new ignition coil, ensuring it is seated properly and reconnect the electrical connector.

4. Inspect and Replace Fuel Injector

• If the ignition coil is functioning, proceed to check the fuel injector.
  • Sub-steps: Remove the injector connector and use a multimeter to test injector resistance (typically 12-16 ohms).
• If defective, replace the fuel injector with a new one, ensuring the O-rings are properly lubricated and seated.

5. Perform Compression Test

• If misfire persists, conduct a compression test on cylinder 2.
  • Sub-steps: Remove the spark plug and insert the compression tester; crank the engine and record the pressure. Compare with specifications (usually around 150 psi or as specified).
• If compression is low, further investigation of internal engine components is necessary (e.g., valve seals, piston rings).