How to Enter the Engineering Menu on a Mercedes

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This has been tested on a 2010 E550 Coupe (C207). It should also work for W212 and current C class models

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Three buttons are involved: the hang up call button...

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The 1 and the # buttons.

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Press and hold the hang up. 1 and # buttons together until you enter Engineering Mode. I can just about do this with one hand if the shifter is in N or D.

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From Engineering Mode you can also enter Engineering Setting. Do this by pressing Hang up, 4 and # together.

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