One problem related to power train has been reported for the 2001 Volvo S80. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2001 Volvo S80 based on all problems reported for the 2001 S80.
Most recent is an upper idler arm went causing the timing belt to skip damaging the motor: cost 4k to fix or 5k to install a used motor. Pressure test came back (no pressure)pistons are ok. Sunroof caved in on my head. I did get cutup with the glass. Car stalled, need new alternator, fuel link shield fell off bottom of car causing the fuel line to drag on road. I had to tape the rubber fuel line up until garage to install a new shield. Passenger side safety belt linkage broke (no passenger side seat belt) there are other 'routine maintainence' tires/brakes/ etc that I did have done. I've take good car, but these large ticket items continue. There are always lights out somewhere on this car. One of the tire rims cracked and I need a new one (dangerous to drive highway with that). I did not think Volvo would except something like this, when I brought the car to gengris Volvo dealer they told me that that 'would not touch' this car and trade-in was not an option. This car is worthless what with all these problems. They told me that this model (2000/2001) of the S80 t6 are lemons and should never have been made road worthy. Is there anything you are able to do. . . I still owe 13k on this worthless car. I should have never bought a Volvo - this is my second and and very willing to share this with other potential buyers if nothing is dome by Volvo with this matter. . . There are more problems I can share if you are interested.