The Mitchell 1 2025 Emission Control Guide provides vehicle-specific emission system details for shops that perform smog inspections. The guide covers domestic and import cars, light trucks, vans (diesel engines), and Class A motor homes with gasoline engines—spanning model years 1966-2025. Specific content features include an emission application table, engine displacement charts, emission control visual inspection procedures, about 40 years of domestic and imported basic ignition timing specifications, the latest EPA emission recall bulletins, 1980-2024 maintenance reminder light procedures, and more.