VAG diagnostic tools - does anyone have info on their workings?

[Hopkins, Ewan]

I've just reveiced my CQ Bentley manual after a 5 week wait! Looks excellent
but, as you'd expect, a fair number of the diagnostic procedures rely on VAG
diagnostic tools, many of which it is difficult to work out what they are
testing. Is there any information out there which either explains how any of
them work or, better still, how to rig-up alternatives?

Here's hoping!

Ewan Hopkins
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