The degree of power assistance is adapted electronically, depending on the speed. If the indicator lamp lights up, the power steering function may be impaired or completely out of action. In either case you must have the steering checked by a qualified workshop immediately WARNING!. If the power steering should fail at any time or the engine is switched off (for instance when being towed), the car can still be steered. However, more effort than normal will be required to turn the steering wheel.