Mileage computer

[JOHN CASTLE]

Hi, I'm new on here, got a 2020 nissan navara and having a few issues at moment, the mileage on my computer says I have 99 miles left to run but my low fuel light has come on, plus filled my adblue up over 3 months ago and when I go to fill it up again it over flows after 30 seconds.
Can anyone help

 

[Old.Tony]

Welcome to the forum.

In my experience the low fuel warning light is not as accurate as one might hope. Mine comes on with anywhere between 8 and 15 litres of fuel remaining in the tank (judging by how much I get in almost immediately after the light appears). That means a range of 80km up towards 150km, although I never rely on it because I don't want to be caught running out and letting the diesel pump operate without lubrication (fuel lubricates part of it).

As for the Adblue, I don't have that in my car (it's old, ok?) but if your car isn't showing a warning light about not having Adblue (example: a blockage in the bottom of the Adblue tank), I'd think it was getting and using enough to keep the ECU happy.