how to fix P0303 misfire code on 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. Ensure the engine is cool before starting.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Replace Spark Plug

1. Remove the engine cover if applicable.
2. Using a spark plug socket and ratchet, remove the spark plug from cylinder 3.
3. Inspect the spark plug for signs of wear, carbon buildup, or damage. Replace if necessary.
4. Apply anti-seize lubricant on the threads of the new spark plug.
5. Install the new spark plug, tightening it to the manufacturer's specified torque (typically 15-20 lb-ft).

3. Inspect/Replace Ignition Coil

1. Disconnect the electrical connector from the ignition coil for cylinder 3.
2. Remove the ignition coil mounting bolts using a socket.
3. Pull the ignition coil out carefully to avoid damaging it.
4. Inspect for cracks or damage. Replace if required.
5. Install the new ignition coil, securing it with bolts to the specified torque (typically 10-12 lb-ft).

4. Test/Replace Fuel Injector

1. Disconnect the fuel injector connector for cylinder 3.
2. Remove the fuel rail if necessary to access the injector.
3. Test the injector using a multimeter to ensure it is functioning properly.
4. If faulty, replace with a new injector, ensuring it is seated correctly in the fuel rail.

5. Reassemble and Reset

• Reconnect any removed components, including the battery terminal.
• Clear the P0303 code using the OBD-II scanner.