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 ...

Part of the frustration of a check engine light is that it’s just so vague. It can signal anything from a looming powertrain failure to something as benign as a loose gas cap. The light will simply ...