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 necessary tools and parts.
• Disconnect the battery to prevent electrical shock.
• Ensure the engine is cool before starting work.

2. Replace Spark Plug

• Remove the ignition coil from cylinder 3:
  • Unscrew the mounting bolts using a socket set.
  • Gently pull the ignition coil off the spark plug.
• Remove the spark plug:
  • Use a spark plug socket and ratchet to unscrew the spark plug from the cylinder head.
• Install the new spark plug:
  • Apply anti-seize compound to the threads (optional).
  • Torque the spark plug to manufacturer's specifications (typically around 13-15 lb-ft).
• Reinstall the ignition coil:
  • Ensure the coil is properly seated on the new spark plug and secure it with the bolts.

3. Inspect and Replace Fuel Injector (if necessary)

• Disconnect the fuel injector electrical connector.
• Remove the fuel rail to access the injector:
  • Unscrew the mounting bolts securing the fuel rail.
  • Carefully pull the fuel rail away from the engine.
• Remove the fuel injector from the rail:
  • Gently pull the injector out of the rail after removing any retaining clips.
• Install the new fuel injector:
  • Lubricate O-rings with engine oil.
  • Insert the new injector into the fuel rail and secure with retaining clips.
• Reattach the fuel rail to the engine and reconnect the electrical connector.

4. Check Ignition Coil (if necessary)

• If the ignition coil was suspected to be faulty, replace it:
  • Disconnect the electrical connector from the coil.
  • Remove the mounting bolts and take out the coil.
  • Install the new ignition coil and torque the bolts to specification.