Two problems related to wiring have been reported for the 1999 Volvo S80. The most recently reported issues are listed below.
1,2) Volvo S80 stalled while my wife was driving 60 mph in rush hour interstate highway traffic. Car lost power, would not accelerate, power steering lost; she got the car to the side of the road just in time before a one-lane construction barrier; otherwise, traffic would have been backed up for miles for a long time (there was no turn around available for tow-truck in this part of the interstate, the tow-truck would have had to back up the highway or try to make it up the grassy divider embankment to get to her stalled car. Luck was on her side; no injuries, and no blocked traffic-this time. 3) car towed to Volvo dealer, where it restarted. The dealer service department could not find the source of the problem, reset sensors and replaced a vacuum hose. I am concerned that this car has a defective etm valve and that the car is still a danger to drive.
Engine wiring harness was cracking and falling apart, leaving wires unprotected against engine and raditor. Dealership replaced all of the plastic wiring harness parts.