how to fix a check engine light on Ford F-150 12th Generation (2009-2014) with P0302 code

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery negative terminal for safety.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, gapping tool
• Remove the engine cover if necessary.
• Locate the spark plug for cylinder 2 (usually the second from the front on the driver's side).
• Use the socket set to carefully remove the spark plug.
• Inspect the spark plug for wear or damage, and replace it if necessary.
• Gap the new spark plug to manufacturer specifications (typically between 0.050-0.054 inches).
• Install the spark plug and torque it to manufacturer specifications (usually around 12-15 lb-ft).

3. Inspect and Replace Ignition Coil

• Tools Required: Socket set
• Unplug the electrical connector from the ignition coil on cylinder 2.
• Remove the retaining bolts using the socket set and take out the ignition coil.
• Inspect for cracks or damage, and replace with a new ignition coil if needed.
• Reinstall the ignition coil and reconnect the electrical connector.

4. Test Fuel Injector

• Tools Required: Fuel pressure gauge, multimeter
• Disconnect the fuel injector connector for cylinder 2.
• Use a multimeter to check for continuity and proper operation of the injector.
• If the injector is faulty, replace it with a new one.
• Reconnect the fuel injector connector.

5. Check for Vacuum Leaks

• Inspect vacuum hoses connected to the intake manifold for cracks or disconnections.
• Use a smoke machine or carb cleaner to identify any vacuum leaks around the intake manifold.

6. Reconnect Battery and Clear Codes

• Reconnect the battery negative terminal.
• Use the OBD-II scanner to clear the P0302 code.
• Start the engine and observe for any recurring check engine lights.