Lincoln 1997 Town Car Owner's Manual page 30

If "CO" or "CS" is displayed, this means that there
is a problem with the fuel indication system and
you should contact your dealer for service as soon
as possible.
FUEL REMAIN — Fuel Remaining
This function shows you how many gallons (liters)
of fuel you have left in the fuel tank.
If your fuel level is above 20 gallons (75.7 liters),
the letter "F" (full) will appear on the display. But
if your fuel level has dropped to below 1 gallon (4
liters), the letter "E" (empty) will appear in the
display.
Because of factors like rounding of numbers and
fuel movement in the tank, your fuel gauge and the
service station fuel pump readings may disagree
slightly.
A problem is indicated if the fuel gauge bar graph
displays only the top two and bottom two bars and
the message center display for Distance To Empty
or Fuel Remaining functions display the letters
"CO" or "CS". If this happens, contact your dealer
for service as soon as possible.
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