Heavy Duty 4M0927803B Front ABS Wheel Speed Sensor Fit Audi Q7 VW Touareg On the MLB-evo platform — Audi Q7 4M, VW Touareg CR7, A4 B9, Q5 FY, A6 C8 — the front wheel-speed pick-ups are active Hall sensors tucked deep into the knuckle, 47.5 mm in. When the sensing face fouls, the sealed plug micro-leaks, or the bearing-integrated encoder ring sheds a tooth, you get the ABS and stability lamps, a speedo that flickers at low speed, and a wheel-speed fault that clears on scan