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The low fuel warning light on my 2015 Monster 821 comes on when I have used 10 liters of fuel i.e. there are 7.5 liters still in the tank. It has a 17.5 liter tank and the light should come on when there are 2.5 liters left. Does any one know a 'tweek'; or, do I have to replace the sensor?
 

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Welcome to Ducati, where fuel level sensors don't work. I've been exploring options for almost 2 years now and it basically boils down to the fact that nobody can produce a good sensor. Mine recently started working again when the ambient temperature is over 60F, but I still don't trust it. I know I get 125 miles per tank, so I just use the trip counter as my fuel gauge.

If you really want to replace the sensor, you have to replace the whole pump unit, it is all 1 piece.
 
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