Heavy Duty WHT003864B Rear ABS Wheel Speed Sensor Fit AUDI A3 VW On MQB-platform VW, Audi, Skoda and SEAT models, a failing rear wheel speed sensor lights the ABS/ESC warning, disables traction control, and leaves C00xx rear-speed codes that clear on scan but return after the next car wash. The WHT003864B is the rear-axle, left-or-right shared Hall sensor: no cable, grey housing, 2-pin plug, ~75 mm body, screw-mounted at the rear knuckle. It replaces the full A→B→C chain,