how to repair a P0301 misfire code on my BMW 5 Series F10/F11 (2010-2017)

Solution

1. Preparation

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

2. Remove Ignition Coil and Spark Plug

• Tools Required: Socket set, torque wrench, and ratchet
• Locate the ignition coil on cylinder 1.
• Remove the electrical connector from the ignition coil.
• Unscrew the ignition coil using a ratchet and socket.
• Carefully pull the ignition coil out of the cylinder head.
• Use a spark plug socket to unscrew and remove the spark plug from cylinder 1.

3. Inspect and Replace Components

• Inspect the spark plug for signs of wear or fouling; replace if necessary.
• Check the ignition coil for any cracks or signs of failure; replace if needed.
• If the spark plug and ignition coil are in good condition, proceed to check the fuel injector.

4. Test and Clean Fuel Injector

• Tools Required: Fuel injector cleaner and appropriate adapter
• Remove the fuel injector from cylinder 1 (may require fuel rail removal).
• Clean the injector using a fuel injector cleaner following the manufacturer's instructions.
• Reinstall the cleaned or new fuel injector into the cylinder.

5. Reassemble and Torque

• Reinsert the spark plug and torque it to the manufacturer’s specifications (typically ~20 Nm).
• Reinstall the ignition coil and ensure it is seated correctly; torque to manufacturer specifications.
• Reconnect the electrical connector to the ignition coil.