Mr Singh

@colinmf - I had the same issue as you. I noticed that I had the car in standby for quite a while with the heating and radio on (Draining the battery and we're in winter months now too) Went to pick the kids up from school, jumped back in the car, turned it on and this is when I first experienced the "Adblue fault no restart after 650miles" - I had only just topped up the Adblue (10 ltrs) about two weeks ago. Luckily I found your post, I trickle charged the battery over night and then in the morning when i started the car, the warning dismissed itself but I was left with the smaller warning. I had an OBD2 Scanner, connected it to the car and cleared all the fault codes I.e. P20BC,P20E8 - ever since, the car has been fine. Thank you so much!

Hi all, This thread was a life saver - had the same problem and was able to resolve it myself. STOP / START - Brake servo restricted requires the brake pressure booster sensor to be replaced. TIP: I had to use a little WD40 on the orange O ring for the sensor to push and clip in. I purchased mine from here: https://www.ebay.co.uk/itm/234156424190?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=uI6ymBN1QH-&sssrc=4429486&ssuid=LlyWfVm0QjS&var=&widget_ver=artemis&media=COPY Please see video for location on the Audi Q5 2019 20250328_134520.mp4