Hey I'm having the same problem (P2187 and P2189) with the wife's '16 LR4 (SCV6). I was thinking a vacuum leak and I hear some slight hissing from the do-hickey on the passenger side valve cover gasket, but hard to tell if that's normal at idle. What was the resolution in your case Delta V? hmmm - Delta V sounds like an automation problem?
Also, having a devil of a time finding a detailed service manual for the 2016 LR4/Discovery with SCV6 engine (gas). Dealership won't sell one and I can only find manuals for the LR4 w/V8 thru 2014. Anybody know where to find one?
PCV Valve replacement was the fix, at least for me (other users have described more severe vacuum issues). Be careful, another user snapped some of the parts of the valve cover that hold the valve, and had to replace his whole cover.
As for Delta V, I picked it up nearly 20 years ago now, based on physics term for acceleration (change in velocity). Have been using it (or variations if it was already taken) ever since.