- computers. Now most modern mechanic shops have in use, highly sophisticated machines which run solely on computers to determine a car's status, simply by being hooked up to a car's exhaust pipe, thus eliminating having to remove any parts of the car, thus not only providing more efficiency, but also saving time in putting parts back on a car. Computers, being highly sophisticated tools, accordingly are difficult to learn and even more so when a person has had no exposure to them in the pa...