how to fix the P0301 cylinder 1 misfire in my BMW 3 Series F30/F31 (2012-2019)

Solution

1. Preparation

• Gather tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the battery to prevent electrical shock.

2. Inspect and Replace Ignition Coil

• Sub-steps:
  1. Remove the engine cover if applicable.
  2. Locate the ignition coil for cylinder 1 (usually near the front of the engine).
  3. Disconnect the electrical connector from the ignition coil.
  4. Remove the bolt securing the ignition coil and pull it out.
  5. Install the new ignition coil and torque to the manufacturer’s specification (typically around 10 Nm).
  6. Reconnect the electrical connector.

3. Inspect and Replace Spark Plug

• Sub-steps:
  1. Using a spark plug socket, carefully remove the spark plug from cylinder 1.
  2. Inspect the spark plug for wear or fouling; replace if necessary.
  3. Ensure the new spark plug is gapped correctly according to the manufacturer’s specifications (usually around 0.6-0.7 mm).
  4. Install the new spark plug and torque to the specified value (typically around 25 Nm).

4. Inspect and Clean Fuel Injector

• Sub-steps:
  1. Disconnect the fuel injector connector for cylinder 1.
  2. Remove the fuel rail assembly (if necessary) to access the injector.
  3. Remove the fuel injector from the rail and inspect for debris.
  4. Clean the injector with fuel injector cleaner or replace it if clogged.
  5. Reinstall the injector and ensure it is seated properly.