Our 95 940 Turbo Wagon has 110K miles. The ABS system has been acting strange -sometimes you feel and hear it kick on when you are coming to a normal slow stop. It also sometimes activates so you hear it at slow speed when you are just coasting - in this case you don't feel it in the pedal but still hear it. Some times it can go a day or two without happening, then it happens a lot. Sometimes after activating several times in a row the ABS light will come on, other times the ABS light just comes on when the system did not just activate. Any time the ABS light comes on the ABS system shuts off so the problem does not happen again until the next engine restart (but I assume the ABS system also would not work).

When this started happening I checked the diagnotic computer and got two codes related to the Rear Speed Sensor. One said "missing signal" and one was an "open circuit" (I forget the exact wording). The wiring seemed fine, so I replaced the speed sensor with a new one. Now a few days later and the system is doing the same thing - I checked the codes and got the same 2 codes for the rear speed sensor.

What do I do now?