how to fix P0301 code in BMW 5 Series G30/G31 (2017-2024)?

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, compression tester, multimeter.
• Disconnect the vehicle's battery to ensure safety while working on electrical components.

2. Replace Spark Plug

• Sub-steps:
  1. Remove the engine cover (if applicable) to access the ignition components.
  2. Disconnect the ignition coil connector for cylinder 1.
  3. Remove the ignition coil using a socket.
  4. Extract the old spark plug with a spark plug socket.
  5. Install the new spark plug by hand to avoid cross-threading, then torque to the manufacturer’s specifications (typically around 20 Nm).
  6. Reinstall the ignition coil and connect the electrical connector.

3. Replace Ignition Coil

• Sub-steps:
  1. Remove the ignition coil as described in the previous step.
  2. Install the new ignition coil and ensure it is seated properly.
  3. Reconnect the ignition coil connector.

4. Inspect and Clean Fuel Injector

• Sub-steps:
  1. Disconnect the fuel injector electrical connector.
  2. Remove the fuel injector from the rail by unclipping it or using a socket.
  3. Clean the injector using a dedicated fuel injector cleaner or replace if damaged.
  4. Reinstall the injector and reconnect the electrical connector.

5. Verify Compression in Cylinder 1

• Sub-steps:
  1. Remove the spark plug from cylinder 1.
  2. Insert the compression tester into the spark plug hole.
  3. Crank the engine for several revolutions and record the compression reading.
  4. Compare the reading to the manufacturer’s specifications (typically around 160-200 psi).
  5. Reinstall the spark plug after testing.