Mercedes-Benz 2007 E -Class Wagon Operator's Manual page 419

Practical hints
What to do if ...
Display symbol Display messages
F
Key
still in vehicle
Please don't
forget your key
Remove key
Get a new key
418
Possible cause/consequence
A SmartKey with KEYLESS-GO* left in the
vehicle was recognized while locking the
vehicle from the outside.
This display appears (for a maximum of
60 seconds) if the driver's door is opened
with the engine shut off and no SmartKey
in the starter switch.
This message is only a reminder.
You have forgotten to remove the
SmartKey.
The SmartKey is malfunctioning.
Possible solution
Take the SmartKey with
KEYLESS-GO* out of the vehicle.
Take the SmartKey with
KEYLESS-GO* with you when leaving
the vehicle.
Remove the SmartKey from the
starter switch.
Contact an authorized
Mercedes-Benz Center.