how to fix P0302 misfire code in Ford F-150 Fourteenth Generation (2021-present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety during repair.
• Allow the vehicle to cool down if the engine has been running.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench.
• Remove the engine cover if applicable.
• Locate the spark plug for cylinder 2 and disconnect the ignition coil connector.
• Remove the ignition coil and inspect it for damage or wear.
• Use a socket wrench to remove the spark plug.
• Inspect the spark plug for signs of wear (e.g., fouling, excessive gap).
• If damaged, replace with a new spark plug, ensuring it is gapped to the manufacturer's specifications (typically around 0.054 inches).
• Reinstall the ignition coil and reconnect the connector.

3. Check and Replace Ignition Coil

• If the spark plug is in good condition, test the ignition coil for proper operation using a multimeter.
• If it does not meet specifications, replace the ignition coil with a new one.
• Reconnect all components and ensure they are secure.

4. Inspect and Test Fuel Injector

• Tools Required: Fuel injector testing kit.
• Disconnect the fuel injector connector for cylinder 2.
• Use a noid light to check for proper pulse at the injector connector.
• If there’s no signal, inspect the wiring or the engine control module (ECM).
• If the injector is faulty, remove it using the appropriate tools and replace it with a new unit.

5. 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 the reading with the manufacturer’s specifications (usually between 120-150 psi).
• If the compression is low, further investigation of valve seals or piston rings may be required.