A quick way to precisely diagnose myriad automotive problems—or at the very least get a rough idea of what might be wrong—is to use an automotive scan tool.

Using an OBD2 scanner is a relatively simple process that can provide crucial information about the vehicle’s electronic and mechanical components alike.

The BlueDriver OBD2 Scan Tool is a Bluetooth code reader that links to your iPhone or Android device. This model happens to be the best-selling code reader on Amazon, and it’s easy to see why.