Originally Posted by michael cole

heres what i did trying to track down an identical problem.connect a DVM to each wheel sensor at the coaxial connectors in the engine compartment.attach meter to windshield with duct tape.drive car at slooow speed and observe voltage readings.the sensor with the lower reading is the problem wheel.rear sensor is either good or bad but you can measure it too by finding the connector under the rear seat.the air gap between the sensor and axle teeth is very critical.but there is no adjustment.possibly the teeth are worn down