Onboard diagnostics (OBD) systems have been around since the 1980s and were developed to help limit harmful automotive exhaust emissions. Between 1988 and 1995, U.S.-built vehicles came with what's ...

you can plug the device into the on-board diagnostic (OBD II) port that has been on all cars since the 1996 model year (see your owner's manual for the location). The device communicates with your ...