Kingbolen Ediag Elite, about £80. Amazon. Someone on the VX forum recommended as it works with the Combo Life (the smaller Berlingo/Rifter version) but it seems the Vivaro C isn't in most databases as VX didn't switch to the PSA van until 2019 - been about since 2016. My issue was this 'gateway' some PSA and other manufacturers have introduced. Looks like mine isn't affected - couldn't get an answer on the internet at all.
Would have gone for a screen type, as before (cost/risk wouldn't work), but this does a hell of a lot of stuff, and I risked the 'investment' rather than go the dealers for a pad change having an electronic handbrake - I'd rather do brakes etc myself as I can clean the calipers up properly - a garage wouldn't. It's a bluetooth gizmo and did it's stuff with my Samsung phone. I've not needed anything clever before - my old Nissan was sort of basic, but I needed general engine/airbag fault detection etc. gadget that I had until it got broken. Never used one on MrsF's Qashqai - it's a 2012, never been plugged in, it just works.
It seems to do a lot of stuff, like you can test up and down on windows - checks it's not a 'switch issue', and the handbrake test was very useful - I was outside the car next to the wheel - they are quite noisy - don't really hear it in the car. ZZZZZ Umph.
I wasn't messing about too much as I'm tagging along on the van being something else - TBH, the Software in the vans are the same - think it's just logo's on screens TBH then subs to Vauxhall connect, which is pointless in this van - live traffic - already use google.
I've seen a few reviews and there has been alot done with the gadget on VW.Audi. You aren't getting into the VAG level stuff like my son does on his laptop - making the dials sweep when they didn't or changing start up logo.
The only thing it doesn't do, that I'd like, is an ad-blue reset, but, I'm already using Wynns Crystal Clear to keep any crystallisation issues at bay - it's like £8 a shot with an ad-blue top up, but if you buy the truck sized, you get 3x shots for a few pence more.... I'm not driving enough to worry about cost, but would rather add this stuff as well to protect the 'system' as the car stands alot.