Both novice and advanced do-it-yourselfers will gain valuable knowledge as they learn the steps the pros use to diagnose the cause of a "check engine" warning. One of the Autozone Complete Car Series of Videos, this information-packed DVD hosted by ASE-Certified Master Technician Bruce Bonebrake guides the viewer step-by-step through common automotive maintenance tasks in easy to understand segments. Identify emission system components and what they do. Retrieve trouble codes using an OBDII scanner. Determine what the codes mean.