How to enter engineering mode in Mercedes COMAND APS NTG 2.5 (hidden secret service menu)

Your Mercedes APS NTG 2.5 system have a hidden engineering mode (hidden menu) that gives you access to all kind of useful information about car systems.
Turn on the ignition, then press and hold buttons: END CALL, 6 and *.

Mercedes-Benz COMAND APS NTG 2.5 system can be found in:
A-Class from 06/2008 to 08/2012
B-Class from 06/2008 to 11/2011
CLS from 03/2008 to 01/2011
Viano / Vito from 09/2010
Sprinter from 11/2009
CLC from 03/2008 to 12/2011
G-Class from 09/2008 to 06/2012
SLK from 04/2008 to 03/2011
SL from 04/2008 to 03/2012
E-Class Limousine and T-Modell from 06/2008 to 04/2009
R-Class from 09/2008
M-Class from 09/2008 to 11/2011
GL-Class from 09/2008 to 06/2012

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