Hello everyone,
I updated my Nav unit from Mk3 to Mk4 but the one I bought it was out of 7er, so I have no ETA and maps freezes sometimes so I know I need coding .

My question is can I do the coding my self if I bought the OBD2 cable?
I wanna really change some of the settings too.
Also the my sound system is not loud enough when I play Cds, but when I connect my phone to a tape kit it's much louder, is this something I can adjust ?
thank you