what does code P0301 mean for my BMW 3 Series G20/G21 (2019-2024)?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety during the repair.
• Allow the engine to cool down before proceeding.

2. Inspect and Replace Ignition Components

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the ignition coil for cylinder 1.
  • Sub-steps:
    1. Disconnect the electrical connector from the ignition coil.
    2. Remove the bolt securing the ignition coil using a socket.
    3. Gently pull the ignition coil out of the cylinder head.
• Replace the spark plug in cylinder 1.
  • Sub-steps:
    1. Use a spark plug socket to remove the old spark plug.
    2. Inspect the spark plug for wear or damage.
    3. Install a new spark plug, torquing it to the manufacturer's specification (typically around 20 Nm).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Check Fuel Injector

• Tools Required: Fuel injector cleaning kit or replacement injector.
• Remove the fuel injector for cylinder 1.
  • Sub-steps:
    1. Relieve fuel pressure from the fuel system.
    2. Disconnect the electrical connector from the fuel injector.
    3. Remove any retaining clips and pull the injector out.
• Inspect or replace the fuel injector, ensuring proper seating and connection.

4. Compression Test

• Tools Required: Compression tester.
• Perform a compression test on 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 seconds and record the compression reading.
    4. Compare the reading to the manufacturer's specifications.

5. Reassemble and Reset Codes

• Reinstall any components that were removed for access.
• Reconnect the battery.
• Use the OBD-II scanner to clear the P0301 code from the system.