I had a warning message appear on my XE 2.0 diesel "incorrect diesel exhaust fluid quality detected". Having finally had a reset by a Jaguar specialist it's back again and I'm being told it's the Nox sensor. I've been quoted exorbitant fees for getting it replaced based largely on the cost of the part. I've searched myself but can't find the exact part and no one seems to have the answer.

 

Could be few other things,.............
Read this discussion from other forum before you dive in for a new NOx sensor https://www.xeforums.co.uk/threads/i...detected.9690/