[MobiusHorizons]

Diagnostics yes, but try to reset the warning light on a German car after fixing the fault. This can apply even when replacing seemingly purely mechanical parts (I think some suspension parts on bmw/Mercedes). You will need vag-com for any vw/Audi and something else proprietary for Mercedes or bmw

[Dah00n]

I have only done so on a Seat, with no trouble. Seems to me that if this is true it is against EU law.