first of all i was probably carrying too much weight in the boot & so not sure if it caused an issue. what has happened the urea lamp went on, [ initially topped up & the urea light went out but engine management remains on. on start up there is a Red Alert / Engine Fault Repair Needed / followed by Emissions Control Fault - Ad Blue, confusing thing is after a few stops & starts all these warnings will disappear for a day or two but appear again. i havent a clue how much ad blue the tank holds but i have put 7 ltrs in . no warning to tell me to top up leading up to the issue,. the car ts driving normally i purposely took it on a motorway at a quiet time & put it through its paces with no problem . Anyones input would be welcome.