Most of the ELM327 units are made in China - sometimes low quality and unreliable operation, but for the price they are hard to beat.
I have a Bluetooth-OBD2 interface and a USB-OBD2 interface from scantool.net. They cost more but are high quality and come with free apps for PCs, smart phone and tablets.
1998 V70s have a unique diagnostic system. The commonly available scanners and apps can only communicate with the engine ECU on a 1998 V70.
Richard Jones at http://jonesrh.info/volvo850/index.html has done a lot of work on some free software that can communicate with the other ECUs in 850s and 1998 V70s. I have used Richard's software to access the auto transmission, instrument cluster, ABS, ECC, airbag and power seat controllers in 850s and 1998 V70s.
Internet Explorer is needed to run Richard's software - I use an older laptop with Windows XP.
Mike
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