how to fix P0301 misfire code on BMW 5 Series F10/F11 (2010-2017)?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool before beginning work.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug gap tool
• Remove the engine cover if applicable.
• Disconnect the ignition coil connector.
• Remove the ignition coil by taking out the retaining bolts and gently pulling it out.
• Remove the old spark plug using a spark plug socket.
• Inspect the cylinder head for debris.
• Install the new spark plug, ensuring it is gapped correctly according to specifications (usually around 0.028-0.032 inches).
• Torque the spark plug to the manufacturer’s specification (typically around 15 Nm).
• Reinstall the ignition coil and reconnect its connector.

3. Replace Ignition Coil (if necessary)

• If the ignition coil shows signs of damage or wear, follow these steps:
• Tools Required: Socket set
• Remove the ignition coil as described above.
• Replace it with a new ignition coil compatible with the vehicle.
• Reinstall the ignition coil and reconnect its connector.

4. Fuel Injector Cleaning/Replacement (if necessary)

• If fuel delivery issues are suspected:
• Tools Required: Fuel injector cleaning kit or replacement injectors
• Remove the fuel rail according to the manufacturer’s instructions.
• If cleaning, follow the injector cleaning kit’s instructions; if replacing, install new fuel injectors.
• Reassemble the fuel rail and ensure all connections are secure.

5. Clear Codes and Reconnect Battery

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear any error codes.
• Start the engine and allow it to reach operating temperature.