How Does A Maryland Car Inspection Work? For Maryland Cars, there are two different types of Car Inspections. To register your car, you will need a Maryland State Inspection. You can find this auto service at any repair shop that has a certified Maryland State Inspector. The mechanic will need your car for about two hours as they look over many different safety points. Unlike other states, the Maryland State Inspection happens one time. Once your car passes, mechanics like ours help keep your car in great shape. In fact, our inspections come with pictures so you can see what we see. If you are looking for a Maryland State Inspection, click on the link below.