Probably one of the best obd2 apps for the iphone and the ipad is obd fusion. this is an app that allows you to read, scan, and erase the check engine light on your car. this is an app that allows you to read, scan, and erase the check engine light on your car.. Bluedriver is a professional diagnostic scan tool and the app is free to install but does require the purchase of the bluedriver bluetooth
