One problem related to front seat power adjust has been reported for the 2002 Volvo S80. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2002 Volvo S80 based on all problems reported for the 2002 S80.
The driver's seat was adjusting itself randomly while driving. However, the controls would not respond when I attempted to re-adjust the seat. Several times while driving, the backrest of the seat would move into a completely horizontal position. Other times, the entire seat (including the backrest) would move as far forward as possible, creating a major driving hazard. I would have to pull over and wait, repeatedly attempting to re-adjust the seat until it randomly started to respond. When I took the car to a Volvo dealership, they could not determine any reason or cause for the problem. I could not afford to replace the power seat module at a cost of $850 (parts & labor). The dealership unplugged the module after adjusting the seat to fit me, but that is not a proper solution. A consumer should not be responsible for replacing a vehicle part due to faulty wiring, especially one that creates a driving hazard on the road!.