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

Solution

1. Preparation

• Gather tools including OBD-II scanner, socket set, multimeter, compression tester, and fuel injector cleaner.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the battery to prevent electrical shock.

2. Replace Spark Plug and Ignition Coil (if faulty)

1. Remove Engine Cover (if applicable)

   • Use a socket set to unscrew any bolts securing the cover.
   • Carefully lift off the cover and set aside.

2. Access Spark Plug and Ignition Coil

   • Remove the bolt securing the ignition coil using a socket.
   • Disconnect the electrical connector from the ignition coil by pressing the tab and pulling it off.

3. Remove Spark Plug

   • Use a spark plug socket and ratchet to unscrew and remove the spark plug from cylinder 2.

4. Install New Components

   • Inspect the old spark plug for wear and replace with a new one, ensuring the gap is correct.
   • Install a new ignition coil onto the spark plug and secure it with the bolt.
   • Reconnect the electrical connector to the ignition coil.

3. Clean or Replace Fuel Injector (if necessary)

1. Remove Fuel Injector

   • Disconnect the fuel lines carefully (ensure to relieve fuel pressure first).
   • Remove any retainers or clips securing the fuel injector in place.
   • Pull the injector out of the intake manifold.

2. Clean or Replace Injector

   • If cleaning, use a fuel injector cleaner and follow the manufacturer's instructions.
   • If replacing, install a new fuel injector in reverse order of removal, ensuring seals are intact.

4. Reassemble and Check

• Reattach any engine covers, ensuring all bolts are tightened to the specified torque.
• Reconnect the battery, start the engine, and check for leaks or issues.