Hello hope all is well,

I received an incorrect DEF pop up on my vehicle I assumed it’s because I used Blue DeF which is not the rated AD blue that Range Rover specifies, so I bought correct DEF and added to vehicle that did not change anything I’m assuming maybe I will need to Drain out, DEF does anyone know if that will fix it or will I have to drain and maybe change or clean def injector or filter. Would anyone know the location and how to remove these things and if so would I need to reset computer and how can I even do that not being a certified dealer/ tech at home, Im bit confusing I know I added alot hope someone can help thanks in advance.