BMW 330 ABS & Traction Control Warning Light On

5DA2 – Wheel speed sensor front right – increment wheel

A fault code scan returned 5DA2, pointing to the front right wheel speed sensor. A visual check showed no obvious problems and there were no relevant technical service bulletins. Reading the live data showed the wheel speed signal was erratic, and a road test brought the fault back with the same erratic readings. We removed the wheel speed sensor and checked the pick-up ring, as corroded ABS rings are a common cause of this fault on these BMWs, but it was in good condition. We then tested the wiring between the sensor and the ABS module by simulating a signal, which proved the wiring was fine and confirmed the wheel speed sensor itself was at fault. During our vehicle health check, we also found the rear brake pipes were badly corroded, leaving the car in a potentially dangerous condition.