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

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug gap tool.
• Remove the engine cover if applicable.
• Use the socket set to remove the spark plug from cylinder 2.
• Inspect the spark plug for wear, carbon buildup, or damage. Replace if necessary.
• Gap the new spark plug to the manufacturer's specification (typically around 0.054 inches for Ford).
• Install the new spark plug and torque it to the manufacturer’s specification (usually 12-15 lb-ft).

3. Check and Replace Ignition Coil

• Tools Required: Socket set, multimeter.
• Locate the ignition coil on cylinder 2.
• Disconnect the electrical connector from the ignition coil.
• Use the multimeter to test the coil for proper resistance (refer to the service manual for specific values).
• If the coil is faulty, remove it using the socket set and replace it with a new one.
• Reconnect the electrical connector.

4. Inspect Fuel Injector

• Tools Required: Fuel injector cleaner, basic hand tools.
• Locate the fuel injector on cylinder 2.
• Disconnect the fuel injector connector.
• Use a fuel injector cleaner to clean the injector and ensure it operates correctly.
• If necessary, replace the fuel injector with a new one.

5. Perform Compression Test

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 2.
• Insert the compression tester into the spark plug hole.
• Crank the engine and record the compression reading.
• Compare to manufacturer specifications. If the reading is low, further investigation is needed for potential mechanical issues.

6. Inspect for Vacuum Leaks

• Visually inspect all vacuum lines and gaskets around the intake manifold.
• Use a smoke machine or carburetor cleaner to identify any leaks.
• Replace any damaged hoses or gaskets.