how to fix P0302 misfire code in Ford F-150 12th Generation (2009-2014)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.

2. Inspect and Replace Spark Plug

• Tools Required: Spark plug socket, ratchet, torque wrench
• Remove the engine cover if necessary for access.
• Disconnect the ignition coil connector for cylinder 2.
• Remove the ignition coil from cylinder 2.
• Use a spark plug socket to remove the spark plug.
• Inspect the spark plug for wear or carbon buildup; replace if necessary.
• Install the new spark plug and torque it to manufacturer specifications (typically 13-15 lb-ft).

3. Inspect and Replace Ignition Coil (if necessary)

• If the spark plug is in good condition, test the ignition coil's resistance:
  • Measure primary resistance (should be within manufacturer range).
  • Measure secondary resistance (should also be within range).
• If the ignition coil is faulty, install a new ignition coil in cylinder 2.
• Reconnect the ignition coil connector securely.

4. Check and Clean Fuel Injector

• If the ignition components are functioning properly, check the fuel injector:
• Disconnect the fuel injector connector for cylinder 2.
• Use a multimeter to test the injector for resistance.
• If the injector is faulty, replace it with a new one.
• Reconnect the fuel injector connector.

5. Reassemble and Reconnect Battery

• Reinstall any components removed during the repair.
• Reconnect the negative battery terminal.
• Clear the error codes using the OBD-II scanner.