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 terminal of the battery to prevent electrical shock.
• Allow the engine to cool down before starting work.

2. Inspect and Replace Ignition Coil

1. Remove the engine cover to access ignition coils.
2. Disconnect the electrical connector from the ignition coil for cylinder 1.
3. Remove the bolt securing the ignition coil and gently pull it out.
4. Install the new ignition coil by reversing the removal steps.
   • Tools Required: Socket set, torque wrench.
   • Safety Warning: Ensure the ignition is off and the battery is disconnected.

3. Check and Replace Spark Plug

1. Remove the ignition coil (if not already done).
2. Use a spark plug socket to remove the spark plug from cylinder 1.
3. Inspect the spark plug for wear, carbon buildup, or damage. Replace if necessary.
4. Set the gap on the new spark plug to the manufacturer’s specifications (typically around 0.028-0.032 inches).
5. Install the new spark plug and torque it to the specified value (usually around 18-22 ft-lbs).
   • Tools Required: Spark plug socket, gap gauge, torque wrench.

4. Inspect and Clean Fuel Injector

1. Access the fuel rail and remove the fuel injector for cylinder 1.
2. Inspect the injector for clogs or contamination.
3. Clean the injector using an appropriate fuel injector cleaner.
4. Reinstall the fuel injector and ensure it is securely fastened.
   • Tools Required: Fuel line removal tool, injector cleaner.

5. Final Checks

1. Reinstall any components removed during the process.
2. Reconnect the battery terminal.
3. Start the engine and monitor for smooth operation.