how to fix P0305 code in my Ford F-150 14th Generation (2021-2024)

Learn how to diagnose and fix P0305 cylinder 5 misfire in Ford F-150 (2021-2024). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery cable to ensure safety during repairs.

2. Replace Spark Plug

• Locate cylinder 5 spark plug (usually the second plug from the front on the driver's side).
• Remove the ignition coil by unscrewing the retaining bolts and disconnecting the electrical connector.
• Remove the spark plug using a spark plug socket and ratchet.
• Inspect the spark plug for wear; replace it if necessary with a new spark plug that meets OEM specifications (gap typically set to 0.054 inches).
• Install the new spark plug and tighten it to the manufacturer's specified torque (usually around 12-15 ft-lbs).
• Reattach the ignition coil and ensure the connector is secure.

3. Replace Ignition Coil (if necessary)

• If the ignition coil is found to be faulty during inspection, remove it from the engine.
• Install a new ignition coil that matches OEM specifications.
• Reattach the ignition coil connector and secure it in place.

4. Test Fuel Injector

• If the fuel injector is identified as the issue, disconnect the fuel lines and electrical connector.
• Remove the faulty fuel injector and replace it with a new one that meets OEM specifications.
• Reconnect the fuel lines and electrical connections securely.

5. Final Checks

• Reconnect the negative battery cable.
• Start the engine and allow it to idle to ensure there are no misfires.

Tools Required:

• OBD-II scanner
• Socket set
• Torque wrench
• Spark plug socket
• Ratchet
• Compression tester (if performing compression test)
• Fuel injector tester (if necessary)

Parts Required:

• Spark plug (specific to Ford F-150)
• Ignition coil (if necessary)
• Fuel injector (if necessary)

Estimated Repair Time: 2-4 hours

Safety Warnings:

• Disconnect the battery before working on electrical components.
• Allow the engine to cool before working on it to avoid burns.