All modern cars are now fitted with advanced computers that run and monitor the internal workings of the vehicle. One of the most important functions these computers provide is to ensure your car is operating within the manufacturer’s safety parameters, i.e. the engine, safety systems (ABS, ESP, DPF etc. etc.) are all operating correctly and safely.
Most people usually only become aware of the functions of these computers when one of the fault warning indicators illuminates on the dashboard (there is usually at least an Engine warning light, ABS warning light and Oil Pressure warning light) and consult the vehicle owner’s manual to read "proceed to an authorized dealer as soon as possible".... "This could indicate a serious problem“. In most cases the warning light will indicate a fault that could be corrected by simply switching the ignition off, waiting 5 minutes and re-starting the car.