Hi folks. Have a 2019 Leon st 1.6tdi. adblue warning has been on for a while so thought I'd finally get some. Went to halfrauds and bought 3.5 litres as my range was still showing as 1000 miles. Emptied the bottle into the adblue tank but range hasn't updated on dash. Now showing 900 miles. Maybe I didn't leave the ignition on long enough before starting engine? Anyone have any idea how I can get it to register?