I've got this and it's diagnosed every car I've had it on, don't buy the cheaper Autel units (I did buy a cheaper one previously and it will only look at engine modules), this will literally look at every module on your car (airbag, abs etc etc), and show you any faults in plain English. It's brilliant. Plenty of videos on Youtube too. I've used it on various cars already (Mondeo, Audi TT, MX5 Mk3) and it's worked every time.
My other Autel unit showed no faults on my Mondeo when I knew there was one, it just didn't cover all the systems, make sure you get the version that covers ALL systems.

https://www.ebay.co.uk/itm/UK-Autel-...kAAOSw1QpaDpng