Evan R certainly has the cost-effective suggestion.
I got a scan tool from IPD 2-3 years ago...see here:
http://www.ipdusa.com/products/5742/114877-foxwell-nt-300-diagnostic-scan-tool
It came with very comprehensive documentation and has worked fine on my 1998 S90, on my son's 2001 XC70 (found a couple of codes resulting in a cheap repair), and a friend's Audi TT. About $80 now, $140 when I bought it!
Nice thing is the reasonably large and clear display which is great if you want to glance at operating data while driving.
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Bob: Son's XC70, my 83 240, 89 745 (V8) and S90. Also '77 MGB and some old motorcycles
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