Mercedes-Benz 2011 SL550 Roadster Operator's Manual page 264

What to do if ...
262
Driving systems
Problem
Ò The white
Distronic
indicator lamp
comes on while
driving.
Ò The red distance
warning lamp
comes on while
driving and an
acoustic
warning sounds.
Vehicle
Problem
8 The yellow fuel
tank reserve
warning lamp
comes on when
the engine is
running.
8 The yellow fuel
tank reserve
warning lamp
comes on when
the engine is
running.
Possible causes/consequences and M Solutions
The Distronic distance sensor has recognized a preceding vehicle.
You are gaining too rapidly on the vehicle ahead of you or the
distance warning system has recognized a stationary obstacle on
your probable line of travel.
X
Apply the brakes immediately.
X
Carefully observe the traffic situation. You may need to brake
or maneuver to avoid hitting an obstacle.
Possible causes/consequences and M Solutions
The fuel level has gone below the reserve mark.
X
Refuel at the next gas station.
The fuel cap is not closed properly.
X
Close the fuel cap.