my BMW X5 G05 (2019-2024) has a check engine light with code P0301

Solution

1. Preparation

• Gather all tools and parts required for the repair.
• Disconnect the vehicle battery to prevent electrical shorts.
• Ensure the engine is cool before beginning work.

2. Remove Ignition Components

• Tools Required: Socket set, torque wrench
• Sub-steps:
  1. Remove the engine cover if applicable.
  2. Disconnect the ignition coil connector for cylinder 1.
  3. Remove the ignition coil from cylinder 1 (typically involves unbolting it).
  4. Remove the spark plug from cylinder 1 using a spark plug socket.

3. Replace Spark Plug and Ignition Coil

• Tools Required: Torque wrench
• Parts Required: New spark plug, new ignition coil
• Sub-steps:
  1. Inspect the spark plug for wear; replace if necessary.
  2. Install the new spark plug into cylinder 1, tightening to the manufacturer’s specified torque (usually around 20 Nm).
  3. Install the new ignition coil onto the spark plug and secure it with the mounting bolt.
  4. Reconnect the ignition coil connector.

4. Inspect and Test Fuel Injector

• Tools Required: Noid light or multimeter
• Sub-steps:
  1. Remove the fuel injector connector for cylinder 1.
  2. Use a noid light to check for injector pulse or measure voltage with a multimeter.
  3. If the injector is faulty, replace it with a new one.
  4. Reconnect the fuel injector connector.

5. Reassemble and Reconnect

• Reinstall the engine cover if removed.
• Reconnect the battery terminals.
• Start the engine and allow it to idle.