SMART Fortwo coupe 2007 Operating Instructions Manual page 204

What to do when ...
Refuelling
If all segments of the fuel tank gauge (see
page 112) are flashing, there is a problem in
transferring the fill level information.
> Find a filling station, fill up and continue
driving using the kilometre display.
> Find a qualified specialist workshop, e.g. a
smart center.
202
>> Practical advice.