The primary function of Opel SPS is to perform online ECU flashing and software reprogramming. This capability covers virtually every major control unit in a modern Opel vehicle, including the engine control module (ECM), transmission control module (TCM), anti-lock braking system (ABS), body control module (BCM), airbag system (SDM), and many others. Common use cases include installing firmware updates, applying security patches, or configuring a new or second-hand ECU after a module replacement.