Smog Check provides auto repair and maintenance services, including smog checks, diagnostics, oil changes, and work on radiators, brakes, and exhaust systems. Many customers report a quick, fast, professional, and easy experience, with mechanics described as the best who kindly squeeze people in. Appointments are often available within 24 hours. They perform free diagnostic checks and suggest the best course of action. However, some customers have had mixed service. One noted that "Closed at 1:00" effectively means no cars after 12:30, and a receptionist failed to warn a customer, stating they were too busy. It is also noted that very old cars or those needing catalytic converter repairs may fail the smog test, which is considered normal. Despite this, many customers plan on coming back from here on out.