OBD2 Car Analyzers are a way to avoid costly repair bills. A good OBD2 analyzer can tell you some things that are wrong with your car. OBD2 analyzers have many other features. For example, I set Automatic to beep when I am more than 10 miles over the speed limit.
List of OBD2 Car Analyzers
Automatic - I've used this for years. However, the company periodically stops supporting older models. In the past, they sent me a free upgrade. Now, mine is so old I have to buy a new one. So, it is time to switch
BAFX 34t5
BlueDriver - seems to be highest recommended
CarMD - I had an early model of this and didn't work well. I replaced it with Automatic.
FIXD
Kobra