BMW GT1 is a self-contained diagnosis system for the workshop, reception and final inspection. For reading out fault code memories of vehicle systems with self-diagnosis capabilities, for encoding/programming control units directly on the vehicle. The new Group Tester One satisfies the more demanding customer requirements with regard to speed, integration in existing networks and relia-bility. The Group Tester One can be used in connection with all BMW model series. It replaces the MoDiC III diagnosis tester introduced in 1998 (service data and new diagnosis data have been available for this tester since July 20-02). Besides its introduction in the passenger vehicle dealership network, by 2005 the basic Group Tester One unit will also replace the MoDiTeC diagnosis tester used at BM Motorrad.