I have friends that subcontract gathering data with the Bosch tool, it is good, but not complete data. Much of the information is not been made available to the general public or aftermarket by the manufacturers.
Even with a manufacturer tool, many of the guys in the field gather the data cannot read/review everything. The file is gathered then shipped to the manufacturer for decoding and review as needed.
You might be surprised what data is actually available if you could read it all!
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