Hi LCA
Devastating news, I myself now own a F-pace (17 plate) and it does knock your confidence in the brand. I had a problem with my XF (64 plate) where the central junction box shorted out almost resulting in a fire. To cut a very long story short after facing a £1750 bill I firstly contacted jaguar crc and then searched the net for simular situations. It turns out that a service bulitin had been published by Jaguar North America which concluded the headlight washer pump seal had failed and resulted in water tracking along the loom into the cjb (argued part not fit for purpose therefore caused fault). Armed with this information and a large number of emails later jaguar graciously offered to pay for all repairs as well as a curtesy car. This brings me to your situation, I would search the net for any known faults (if you haven't already) which my have a direct bearing on you case. I did find a site the listing a number of F-pace faults, a couple are engine related.
Best of luck with your endeavours
JAG61ANS
