Did you ever figure this one out? I have a bad left rear wheel speed sensor. I'm past warranty, so I'm replacing it. I ordered the part and plan on installing it myself next weekend.
'13 35i M-Sport X3 | JB4 Stage 1 | BMS Intake | H&R Springs | Gloss black grill | CF Wrap and Coded by me | Recaro Child Seats
'15 M3 DCT AW/SO | RKP Diffuser | P3 | M Perf Spoiler | iND Exterior Trim | Recaro Child Seat