Swaybar links and tie rod end links are notorious issues on S60's. I would start with the swaybar links if when the vehicle is off the ground there is any vertical movement when you grab hold, the PAIR need replaced. Secondly the tie rod end links go bad often... While you still have the vehicle in ...

This is one of the many issues that I have had with my '02 s60. The ignition switch (the place the key goes) was broken. I got the part from the dealer, it came on a slow boat from Sweden. They have to be special made for your key with the VIN number. It was an absolute pain in the rear to change on ...

I don't know what qualifies as special tools? But I changed mine last summer, I did a pressure test and mine had a pinhole leak. Its pretty straight forward, and other than Torx bits, I don't recall needing anything to exotic.

Get the code read... I had that a few months ago at WOT and it happened to be the turbo boost solenoid. When I read the code, it said that I had an "overboost" Bought the part from my dealer $65. It took 10 min to put in. Thee vacuum lines and a wire harness.