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

Solution

1. Preparation

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

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the ignition coil from cylinder 1.
• Unscrew the spark plug using a spark plug socket and inspect it for signs of wear, fouling, or damage.
• Install a new spark plug with the correct gap (consult BMW specifications).
• Torque the spark plug to specifications (usually around 25 Nm).

3. Replace Ignition Coil

• Tools Required: Socket set, torque wrench.
• Remove the ignition coil from cylinder 1.
• Install the new ignition coil and connect the electrical connector securely.
• Torque the ignition coil screws to manufacturer specifications.

4. Inspect and Repair Vacuum Leaks

• Tools Required: Smoke machine (if available), vacuum gauge.
• Use a smoke machine to check for vacuum leaks around the intake manifold.
• If leaks are found, replace the affected gaskets or hoses as needed.

5. Reassemble and Test

• Reconnect the battery.
• Start the engine and allow it to reach operating temperature.
• Monitor for any check engine lights or abnormal behavior.