One problem related to brake antilock wheel speed sensor has been reported for the 2002 Nissan Altima. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2002 Nissan Altima based on all problems reported for the 2002 Altima.
Faulty rear speed sensor turning the abs system on/off. This failure would allow the brake pedal to push to the ground and not allow for proper braking. In fact it would feel as if I were loosing the brakes entirely.