BMW X3 Cylinder 6 not firing, suspected electrical issue based on diagnostic codes on BMW X3

Some BMW X3 owners report experiencing issues with cylinder 6 not firing, as indicated by diagnostic code P0306, which can lead to a loss of power, rough idling, and potential damage to the catalytic converter over time. Common causes include worn or defective ignition system components, faulty spark plugs that fail to ignite the air/fuel mixture, and problems with ignition coils. Owners are advised to check the spark plugs in cylinder 6 and inspect the ignition system components for proper functioning. Additionally, using a BMW-specific scanner for accurate diagnosis is recommended. Some owners also note that vacuum leaks from the DISA valve and potential issues with the ECU/DME should be investigated if replacing spark plugs, coils, and injectors does not resolve the misfire. Addressing these concerns systematically is crucial for restoring proper engine performance.