NOX sensor fault

I don't know if this applies to VAG cars but I just saw a report that Range Rovers are getting a lot of these NOX sensor faults showing up as I did on my Superb. The cause seems to be running the Adblue too low which then throws up the code for NOX sensor. As I know to my cost we had a NOX fault code which then disappeared after some considerable miles. The quoted cost to replace was euro 500 so it did not get replaced at that time. We did let the Adblue run low  some time ago before this and then had a related problem (see another post) so I am thinking we had the same cause and effect. It just takes a long time to throw up a code and a long time to reset itself after Adblue is topped up.

Anyone recognise these faults??

It has also been noted that Adblue is a way to save the planet yet there are millions of plastic spouted canisters being left in landfill!!