Very nice illustrations, but you are missing important systems that are found on many/all cars from the past 20 years, like front wheel drive, CV joints, closed

Very nice illustrations, but you are missing important systems that are found on many/all cars from the past 20 years, like front wheel drive, CV joints, closed-loop emissions control, OBD-II and CAN bus, distributorless (electonic) ignition, electric power steering, CVTs and dual-clutch automatic transmissions, and TPMS. Diagnosing a check engine light by reading OBD-II codes, for example, is something that every owner of a car produced after 1996 will eventually need to deal with. You should rebuild your content around systems that are found on the majority of cars on the road today.