This is one of my favorite gadgets of all time. No more going to a shop to get the check engine codes checked and interpreted by someone else. It also alerted me while I was driving that I had two new codes. I drove immediately to the place I intended to get it repaired and the mechanic told me if I hadn’t brought it in when I did, I might have to pay for much more costly repairs and my car breaking down on me. The app is also constantly being updated and made better. No complaints there either.