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 ...

When the check engine light comes on in a vehicle, it’s indicating that there is some issue with the car that should be checked out. It could be something minor, such as the gas cap not being screwed ...

Q I have a 2002 Toyota Camry with 82,000 miles. The check-engine light came on, and the dealer technician gave me codes P0440 and P0442 to replace the fuel-filler neck and gas cap at a cost of $481 ...