Snap on functions on American cars usually work better because they Suck The Big Hind Teet of all the US car makers. They jump when the Car makers say jump , and pay for the software licensing they put on  scan tool that costs 3 times more but has only half the (Hit or miss) functionality of Autel with European. Snappy is in Bed with OEs designing  new funky proprietary special tools for Sh@tty Cars that keep cars going to the dealer for repairs longer or aftermarket techs having to continually be on the Hind teet of the tool truck man, kept  in debt buying the latest  funky must have special tools. Snappy actually  Beta test the software on cars rather than program  theoretically computer simulated by Chinese geeks who Gunea Pig testing Beta Level software released to us to send in Data logs if it doesn't work. Lol, For every car it lets you down on , luckily there's 2 that it impresses me still.