It could be ...
... both things.
A stuck float and the need to calibrate.
To get to the float you'll have to remove the battery, the battery tray and then you'll get into the tank. If you go this route you'll need a new gasket because the OEM will be swollen and won't fit after it's removed.
Finally it may be necessary to calibrate and you'll need either a PST-II or a PIWIS computer to do so.
Happy Boxstering,
Pedro
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