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the second post was on another Audi forum https://www.audi-sport.net/xf/threads/432110/

Hi all, the Audi garage refused to accept anything wrong stating it was driver style and was a stall. It was suggested we turn the stop start off, I do this every time I drive now and don’t have this problem. I have stalled car once and knew it was a stall. Not the same as the random cut outs at traffic lights or changing down.

Thanks for coming back on this Hector. Taking you points, I think it’s fair to agree that the battery doesn’t need to be coded. Varta would have been the OE. battery, and should rule out that being the offender, although I have had a couple of issues of them failing in recent years, and now favour Exide. Does the car have an alarm and possibly an immobiliser? If so, you would need to measure the drain on the battery after a couple of minutes -when the car has fully shut down.

Hi Steve I did fill it up I've had reset scr sensor and scr lock but no luck I've checked the ad blue sensor it's working fine even i asked the specialist from audi he said if the nox sensor 2 downstream doesn't give you live data that definitely could be the issue which can cause the warning light on dashboard so that's why I was wondering if I'll find the nox sensor 2 I may be able to fix the problem but unfortunately on this car seems to be doesn't have one I've got Audi A6 c7 ultra 2017 engine code it's DDDA I've looked on manual the nox sensor 2 it's supposed to be near to ad blue tank but the isn't any sensor at all so I gave up and I booked an appointment for audi dealer to fix the problem I'll keep you posted have a good day 😊