Automobile electrical systems have steadily evolved over the past few years and currently they integrate automatic computer controls of vehicles. In the initial days, automotive electrical systems consisted of only basic wiring equipment and machinery that were primarily used in order to distribute power to other parts of the vehicle. Wires, switches, controlled motors and relays were the key constituents; however, now, automotive electrical systems include sensors, alternators, actuators, battery, generator, oxygen sensors, starter drive, high power electrical systems, starter solenoid and other devices. One of the first uses of a computer in an automobile was for the engine control unit. Automotive manufacturers around the world began to use early versions of computer systems to perform only one particular function. However, in 1968, Volkswagen presented the first electronic fuel injection (EFI) system controlled by computers. The system was manufactured by Bosch. Computer chips in automobiles since then have become an integral part of an automobile design. Presently, almost all car manufacturers use computer chips in one or multiple parts of the vehicles they produce.