John wild

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 😊

Thank you very much for response well I start from beginning i had issue with ad blue system recently I've had some tests regarding ad blue issue so I've got warning light on dashboard like ad blue system fault no restart within 600 m I've checked everything what can cause this warning light so at the end I've concluded it's nox sensor downstream which diagnostic tools showed it's not installed isn't reading any live data so as I'm concerned if the nox sensor downstream isn't working or is missing that could trigger the warning light on dashboard by the way no other fault codes found it Thank you in advance

1 2 3 and 4 are exhausting temperature sensors A is the lambada sensor then B is nox sensor upstream So I couldn't find other sensor to the dpf I'm literally giving up )))) 20250917_161510.heic

I've checked near the catalytic before and after no sign of nox sensor 2 I've checked everything it looks like there isn't nox sensor but I definitely know there must be 2 nox sensor before and after catalytic

Hi there if anyone knows the location of downstream sensor 2 on c7 2.0 tdi ultra engine code ddda I've checked the exhaust system and near to the ad blue tank no luck can't find it 😢 anyone can help with that any thoughts please Thank you in advance

Hi there I've a6c7 ultra engine code ddda recently I've got this yellow warning on dashboard so I've scanned for engine faults no luck i did some research i did top ad blue tank reset the scr tank level and the scr lock the I've checked the pressure ad blue 5 bar did some tests with ad blue injector tried to do inducemennt system reset no luck at all I did some dpf regeneration no luck also I've checked the nox sensor upstream and downstream and I've got some results upstream it seems to be fine but downstream it's showing on system not installed so I'm wondering if that could be issue with warning Any thoughts thank you in advance