Emmissions problems
 

I've got a '99 S80 with ~90k miles on it, all of a sudden its got lots of problems. Check engine & Emmissions lights were on, just replaced all 6 coils, but car is still running really rough (check engine light still on), and I can smell fumes in the car while driving. I've been told I need to replace 2 out of the 4 emmissions sensors - not sure which 2. Is this feasable to work on - i.e. are they in an accessable place on the car, & where is the best place to buy them? Honestly thinking I ought to dump the car & start fresh. Thoughts?

RE: Emmissions problems
 

the etm maybe? My emissions system and Check engine light were on, when i brought it to aftermarket mechanic, he said it was a misfire in cylinder #5, but I ended up going to volvo, and they told me it was my throttle body. They replaced it under warranty(10yrs-200,000miles)