It's not just volvo is it , its Renault, Citroen microsoft , sony playstations etc etc for example ... they spend £ millions developing their hardware and software and providing a team of 10 or so people supporting it , so want to get their money back and they do this by charging their dealers around £6000 a year for software licences , and communication lines . So hence your £50 or whatever charge for code reading ..
Any you CAN have the proper diagnostic SW and HW like the independants do but you have to pay for it ...
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 My comments are only based on my opinions and vast experience .
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