With the increasing complexity of today's cars functional safety and compliance guarantees are more and more dicult to obtain. During the life time of a vehicle the detection of malfunctioning non-mechanical components requires meanwhile more attention than the maintenance of its mechanical counterparts. A full fledged formal verification of the overall car is not realistic and even hard to obtain for single non-trivial components such as assistant systems. Furthermore, it does not support fault detection at run time. We suggest an approach towards formal safety, compliance and fault detection at run time via an auditor. The auditor is automatically fed out of the engineering and production process by a suitable abstract specification and respective model of the car and can detect then detect violations and faulty components.