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On modern MED17 and EDC17 engine control units used in VAG and BMW vehicles, the immobilizer system is tightly integrated into the ECU software and vehicle security architecture. In specific scenarios such as engine swaps, race cars, test benches, or ECU replacements, immobilizer deactivation can be a practical and necessary solution.

A properly implemented immobilizer patch allows the ECU to operate independently, enabling reliable engine startup without compromising core engine management functions. This is especially useful for non-road applications, development environments, or vehicles where the original immobilizer infrastructure is no longer present.