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from when i was in the private repair industry, i remember occasionally dealing with some software issues, mainly regarding higher end and imported cars, ie BMWs and some lexus/toyotas. yes you can buy the software in most cases, but iirc, there were a few cases where the software hadnt been released yet or there just wasnt a version for that operating system. in those cases, we had to turn work away to the dealer. and with the more and more complew computer systems, the amount of software needed increases every year. yes you can scan and read codes, but theres other stuff as well.
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