refuel sign comes up while the tank still more than halfway

[sam2020]

hi all
i bought a vauxhall Astra 2013 its cat D recorded (just one door was damaged and has been replaced ) but now i have problem with the fuel warning it comes up and when i go the the patrol station to fill it up i find the tank still halfway full
does anyone have this problem before or any idea how to sort it out?
also i would like to know if the car still under warranty or the damage has a voided it? because im thinking to take it back to vauxhall ( i have proof of the previous door damaged and its only the door so nothing to do with the rest of the car)
please advise
thank you

[tucpal]

You should still be covered but any problems with the area of old damage would not it just sounds like I faulty sensor hopefully

[Rusty2009]

I would say a faulty sensor.

[Rusty2009]

I moved this thread to the correct section.