Hi all, 2016 A4 TDi 150. The engine management light has appeared along within adblue fault, no restart in 650 miles. Had filled with Adblue 4’weeks ago. Took the car to Audi today, they topped up the adblue but fault didn’t clear. Advised to book in for diagnostics. Have done for Tuesday. Was wondering if anyone else had experienced similar issues? If so, how was it sorted? Car is out of warranty so concerned about potential costs!!