The Mitchell 1 2020 Emission Control Application Guide is for domestic and import cars, light trucks, vans (diesel engines), and Class A motor homes with gasoline engines, model years 1966 through 2020. The 2020 edition features emission application tables, engine displacement conversion charts, emission control visual inspection procedures, approximately 40 years of domestic and imported basic ignition timing specifications, 1980-2019 maintenance reminder light reset procedures, the latest EPA emission recall bulletins, I/M areas that require ignition timing and EGR function testing, as well as a quick reference listing for major systems, devices, and components.