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 ...

Q: I have a 2004 Saturn L300 V-6 with 67,000 miles. About a year ago, the car experienced electrical problems and needed occasional jump-starts. Various warning lights appeared, including the Check ...