I would bet this particular warning light has to do with your gas cap or evap valve or something along those lines.
'11 Z4 30i (Sold!);'11 X3 28i (Sold!); '15 M235i (Recalled/Crushed!); '15 28i X3 loaded; '14 x328i loaded & Mineral Grey '16 M235i Perf Edition, Dinan Stage 2 & CAI