Possible Fault Causes
WARNING: This page does not describe the selected car, but rather 53 other vehicles, including the 2013 BMW X6 M, 2013 BMW X5 M, 2013 BMW M6, 2013 BMW M5, and 2013 BMW Alpina. However, it is still accessible from the selected car via links, so may be relevant.
corrosion in plug?) 1a. Repeatedly remove the plug and then FIRMLY insert it again 2. Electrical check of wiring 3. Check catalytic converter (FSD lean fault may be entered for the other bank) 4. Piston rings, injector valves, positive crankcase ventilation OK? FSD fault? Then continue there! 5. Replace wires or plugs on O2 sensors as indicated