Engine controller is one of the most important components in our cars. It is a device that controls various elements of the engine; it can for example control pressure in the turbocharger, ignition timing or throttle operation. In modern cars engines have a lot of sensors that provide a lot of information to the controller in real time. The control unit can react quickly by for example increasing the engine speed as soon as the accelerator is depressed. Therefore, damage to the controller may cause many problems with driving, the brakes and engine power.