Dean Hill

You would think Audi have eliminated this as a possible cause on your vehicle to be honest. When you say they have changed it twice - do you mean the same sensor twice or BOTH the sensors, just to be clear there are 2

Hi Merc_320, although im sure Audi have already eliminated both NOx sensors on your SQ7 - my resolve did come with replacement of NOx sensor 1 despite the error codes and test plans suggesting a fault with NOx sensor 2

Thanks Flobble ive replaced nox sensor 2 as instructed by ODIS, but have since learned nox sensor 1 may be faulty (giving low readings) which causes the diagnostics to believe sensor 2 is reading incorrectly. currently running tests. Will post update. for reference this vehicle has no battery issue

Flobble.. Hi, did you get this issue resolved? We have a SQ7 with same issue. After repairs around 50-100 miles the Ad-Blue shut down reactivates where it left off. Most recent warning went straight to Red warning - restart not possible, without any countdown