how to fix the P0303 code in my Ford F-150 Fourteenth Generation (2021-present)?

Learn how to diagnose and fix P0303 cylinder 3 misfire in Ford F-150. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the negative battery terminal to ensure safety during repairs.
• Allow the engine to cool if it has been running.

2. Inspect and Replace Spark Plug

1. Remove the engine cover if applicable.
2. Locate and remove the spark plug wire or ignition coil from cylinder 3.
3. Use a spark plug socket and ratchet to remove the spark plug.
4. Inspect the spark plug for signs of wear, fouling, or damage.
5. If necessary, replace the spark plug with a new one (use OEM specifications).
6. Reinstall the spark plug and reconnect the ignition coil or spark plug wire.

3. Test and Replace Ignition Coil (if necessary)

1. Using a multimeter, test the ignition coil’s primary and secondary resistance according to the vehicle’s specifications.
2. If the ignition coil is defective, remove it from cylinder 3.
3. Install a new ignition coil, ensuring it is seated properly.

4. Check Fuel Injector (if necessary)

1. Locate the fuel injector for cylinder 3 and disconnect the electrical connector.
2. Use a multimeter to test the injector's resistance. Compare it to specifications.
3. If faulty, remove the fuel injector using a fuel injector puller if required.
4. Install a new fuel injector, reconnect the electrical connector, and ensure no leaks.

5. Final Assembly

• Reattach any components that were removed, including the engine cover.
• Reconnect the negative battery terminal.