I have a 2000 Explorer that gets about 4,000 miles a year. For about 1 year my right front abs sensor would occasionally loose the signal at low speeds and cause ABS activation. Ohm readings and scope showed normal operation. No trouble codes were set. Yesterday my right front wheel bearing/hub assembly started making noise. I believe that loose bearing material may have accumulated on or near the tip of the sensor and/or bearing play may have been an issue. NOTE: I give the vehicle an annual inspection with LOF and there was not any noticeable looseness in the hub.

TIP: When facing an unexplained loss of ABS wheel speed signal. Examine the wheel hub/bearing assembly carefully. The signal loss might be your first indication of a bearing issue.

Dennis Poma
Technician (Retired)
Dennis Poma
Plainfield, Illinois, USA