I also second the O2 sensors, had the same thing happen recently. Forgot to label them... they are labeled now
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IG @pobudz | '08 e92 335i - MOTIV 750 w/ PI & AEMMHD tuned, tial bov, ER cp, ADE "800HP" fmic, Corsa 3.5" catback, m3 suspension bits (F&R sway, F&R control arms), rogue toe arms, MOTIV motor mounts, UUC trans mounts and RTD shifter. H&R sports and Koni's, 17x9/17x10.5 Forgestar F14 w/ Mickeys. Quaife 3.08 LSD, M3 subframe and diff bushings. MOTIV Twin disk. Fuel-IT Stage 3+.