how to fix P0303 code on 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 required for the repair.
• Disconnect the battery by removing the negative terminal to ensure safety.

2. Replace Spark Plug

• Remove the engine cover if necessary using a socket set.
• Remove the spark plug wire or ignition coil from cylinder 3.
• Using a spark plug socket, remove the old spark plug and inspect the condition.
• Install a new spark plug with the manufacturer's specified gap, using a torque wrench to tighten to the recommended torque (usually around 13-20 lb-ft).
• Reconnect the ignition coil or spark plug wire.

3. Replace Ignition Coil (if faulty)

• If the ignition coil was found to be faulty during diagnostics, remove it by unscrewing the mounting bolts.
• Disconnect the electrical connector from the faulty ignition coil.
• Install the new ignition coil, ensuring it is securely fastened and the connector is properly attached.

4. Clean or Replace Fuel Injector (if necessary)

• If the fuel injector was found to be clogged, remove it by disconnecting the fuel line and electrical connector.
• Clean the fuel injector using a fuel injector cleaner or replace it with a new unit.
• Reinstall the fuel injector and ensure all connections are secure.

5. Reassemble and Test

• Reattach any components removed during the repair, including the engine cover.
• Reconnect the battery terminal.
• Start the engine and check for normal operation.