Unfortunately you can no longer rely on stock "modes" - this includes hand held flashing devices. It does still vary model to model, but I think by 2014 and the replacement (phase out) of some of the current ECU families that they will all have this feature built in.
Our suggestion is still to have it serviced away from the dealer when ever possible. No point in giving them money for services that may effect your rights later on - better spending it with someone who will look after you.
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