how to troubleshoot a P0302 code on my Ford F-150 13th Generation (2015-2020)

Solution

1. Preparation

• Gather your tools and parts.
• Disconnect the negative terminal of the battery to prevent electrical shorts.
• Allow the engine to cool down before starting work.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, spark plug socket, torque wrench.
• Remove the ignition coil cover if applicable.
• Disconnect the electrical connector from the ignition coil.
• Unscrew the ignition coil and remove it from the spark plug.
• Remove the spark plug using a spark plug socket.
• Inspect the spark plug for wear, carbon buildup, or physical damage.
• If damaged, replace with a new spark plug, ensuring it is gapped according to manufacturer specifications (typically around 0.054 inches for Ford F-150).
• Reinstall the ignition coil and cover, reconnecting the electrical connector.

3. Check and Replace Ignition Coil

• If the spark plug is functioning well, proceed to check the ignition coil.
• Tools Required: Multimeter, socket set.
• Test the ignition coil with a multimeter to ensure it has the correct resistance (consult service manual for specifications).
• If the coil is faulty, replace it with a new ignition coil.
• Reassemble components as necessary.

4. Compression Test (if needed)

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 2.
• Insert the compression tester into the spark plug hole.
• Crank the engine to take a reading and compare it to specifications (ideally above 100 psi).
• If compression is low, investigate further for potential valve or piston issues.

5. Check Fuel Injector

• Tools Required: Noid light or fuel injector tester.
• Disconnect the fuel injector connector from cylinder 2.
• Connect a noid light to check for injector pulse while cranking the engine.
• If there is no pulse, replace the fuel injector.
• Reconnect the fuel injector and electrical connector.

6. Inspect for Vacuum Leaks

• Visually inspect all hoses and the intake manifold for cracks or disconnections.
• Use a smoke machine or propane to check for leaks around the intake area.
• Repair any leaks found to ensure proper air-fuel mixture.