Thanks for the DIY! I threw the code a few weeks back and have been meaning to take care of it.
I used MAF cleaner, and followed your guide. Did the bottom one first, then the top one. Not sure if its placebo but the car seems to pull harder.
2008 BMW 135i N54 6MT | COBB AP | BMS DCI | VRSF DP | ETS CP & TIAL Q BOV | BERK DP-BACK FULL STREET EXHAUST | VMR V718 GUNMETAL | KW V1 COILOVERS | MICHELIN PSS 225/255 | GP THUNDER 6500K | SIDES 30% & REAR 20% TINT | KENWOOD AMP & ALPINE 12" SUB TYPE-R | SELF-CODED | DIY-CDV