Some Volvo codes can't be reset...usually the Air bag (SRS) AC, etc.- things that are Volvo specific. However, the main stuff...engine management, transmission, ignition, etc. can be reset by hitting the "erase codes" button on most any scanner. Good luck and let us know how it worked out.
'98 S70 T5 Emrld Grn Met/Beige Tons of Upgrades Mobil-1
'04 V70 2.5T Red/Taupe Some Upgrades Mobil-1
94 850 Sedan NA Drk Blue/Tan
'00 V40 Purple/Grey Mobil-1