George.
You need to learn about Bay 13 site. This great site will help you a lot
http://www.volvospeed.com/maintence.htm#Filters
For the 2001, follow the S80 filter instruction. The older one is the top instruction.
The 2001 also has a coil on plug design. When you get in there, under the plastic cover, take a photo of the wiring layout for reference. There's one or two confusing spots. After that, taker off each coil by pulling them straight up, one at a time, after removing the small bolt, and find plug underneath.
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