How to Use Automotive Diagnostic Scanners: - Understand Obd-I and Obd-II Systems - Troubleshoot Diagnostic Error Codes for All Vehicles - Select the RScan your own codes to save money, fix problems, or get the best performance out of your ride! Scanning the code to determine why your check engine light has come on is frequently more costly than the repair itself! Scanning automotive systems at home can save you money and only requires the ability to plug a phone or tablet into an easily accessible port on the car. With the right dock, it is possible to perform diagnostic checks in your very own