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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool if it has been running.

2. Inspect and Replace Spark Plug

• Tools Required:
  • Socket set
  • Torque wrench
  • Spark plug gap tool
• Remove the engine cover if applicable.
• Locate cylinder 2 (typically the second cylinder from the front on the driver's side).
• Remove the ignition coil by unbolting and disconnecting the electrical connector.
• Remove the spark plug using a spark plug socket.
• Inspect the spark plug for signs of wear or fouling; replace if necessary.
• Ensure the new spark plug is gapped correctly according to manufacturer specifications (usually around 0.030-0.035 inches).
• Install the spark plug and torque it to the manufacturer’s specification (usually around 12-15 ft-lbs).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Inspect and Replace Ignition Coil

• If the spark plug is in good condition, test the ignition coil.
• Tools Required:
  • Multimeter
• Disconnect the ignition coil connector and use a multimeter to test for resistance.
• Compare resistance readings with manufacturer specifications.
• If the ignition coil is faulty, replace it with a new one.
• Reconnect the ignition coil and ensure it is properly seated.

4. Check Fuel Injector

• If the misfire persists, check the fuel injector for cylinder 2.
• Tools Required:
  • Noid light or multimeter
• Disconnect the fuel injector connector and attach a noid light to check for signal.
• If no signal is detected, inspect wiring and connectors for damage.
• If the injector is faulty, remove it and replace it with a new one.
• Reconnect the fuel injector connector.

5. Final Checks

• Reconnect the negative battery terminal.
• Clear the P0302 code using the OBD-II scanner.
• Start the engine and let it idle to ensure the misfire is resolved.