Mercedes-Benz E-Class Coupe 2021 Operator's Manual page 354

352 Display messages and warning/indicator lamps
SmartKey
Display messages
Possible causes/consequences and
Á
* Have SmartKey replaced.
Obtain a New Key
Á
* The SmartKey battery is discharged.
Replace Key Battery
Á
* The SmartKey is currently undetected.
Key Not Detected (white
display message)
Consult a qualified specialist workshop.
#
Replace the battery ( page 67).
/
#
Change the location of the SmartKey in the vehicle.
#
If the SmartKey is still not recognized, place it in the marked space for starting with the SmartKey
#
( page 142).
/
M M Solutions