While enabling then disabling the traffic sign recognition, I must have clicked something wrong. My 2016 e-tron allows me to hit the "EV" button next to the 'drive select' button above the HVAC controls and it will change the mode in the gauge cluster, but the pop up screen shows an error message "e-tron mode: The selected system is currently not available" and does not show the e-tron menu in the MMI Car Systems menu. If anyone knows how to add that menu back, please help.