[andy_d]

as has been said a lot of times
vida software and a dice unit are the only reliable ways to read the car

vida software has ALL the part numbers for your car, you either
a/ enter the VIN and select the options
b/ connect to the car with a Dice unit and it Reads the VIN and fills in most of the options

at this point you can search for any of the parts on the car, get a pictoral view And the part numbers.
If you are connected to the car it will read any DTC's , give you the Correct volvo step by step how to fix them and then Clear the codes

yes other odb2 scanners Might work, might not, Certainly wont talk to much more than the engine , will NOT talk to the SRS systems, most probably wont talk to the gearbox, and Certainly will NOT talk to any of the car's security features

there are Lots more valid reasons why most of us say "use a main dealer or an indy With dice/vida if you dont have your own",, and your finding out why we all say that