Code readers are diagnostic tools that every car owner should consider owning. Having one of these is as important as carrying a spare tire or a fire extinguisher in the trunk. Back in the day, before ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." Since the mandate of the OBD-II port in 1996, auto mechanics have accessed vital information about your ...

Add Yahoo as a preferred source to see more of our stories on Google. Modern cars are technological marvels, and understanding what’s happening under the hood has never been more important—or more ...