K-Line is the cable that interacts with vag-com etc when you run a diagnostic through the stock head unit.
Problem that can happen is that an aftermarket head unit will liven that cable up and when a diagnostic is applied, it will BLOW up the diagnostic machine. Most vag-com leads have k-line protection for this very reason, but you may find that if you go to a main dealer, they will refuse to connect their diagnostic machine to your car, which means no service resets etc.
Thats why I wondered about how the Mexico dealt with the K-Line.
P.S. Only teasing about MJ, your taste is YOUR taste.
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