LAUNCH Key Matching Instruction for OPEL 1 Key Matching Instruction for OPEL Immobilizer and Anti-Theft Warning System The main available function of X-431 is [Match Remote Key] for Anti-Theft Alarm system of OPEL and [Match Ignition Key] for the immobilizer system. Please follow the screen tips to perform the easy operation. Precautions: 1) The engine can be started only with the authorized keys that have been matched with the vehicle immobilizer controller. 2) When performing key matching, always match all the keys at the same time with the vehicle immobilizer control unit. 3)