One problem related to mid/rear seats assembly has been reported for the 2004 Nissan Sentra. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Nissan Sentra based on all problems reported for the 2004 Sentra.
Drivers seat detaches from sliding rail or bolt in floorboard seat mechanism in the foward and possibly other, positions. To correct failure I slid seat bottom back and then foward into a different position and it secures until the seat is moved again.