Engine Control Unit [Clone/Reset/Immo-OFF]

The Mercedes-Benz remanufactured control unit, also known as an Engine Control Module (ECM) or Engine Control Unit (ECU), serves as a direct replacement for specific Mercedes-Benz vehicles. This particular unit is a Bosch Engine ECU, with part numbers 0261201278 and cross-references to OEM part numbers like 1131531991 and 0261201616. It is listed as compatible with the CLS 500, G-Klass, and ML 500 models. This remanufactured control unit is offered with several variant options to suit different needs. These include a 'Clone' option where data is transferred from the original faulty ECU, a 'Reset (Virgin)' option that returns the ECU to a new, programmable state, and an 'Immo-OFF (Unlocked, Decoded, Free Run)' option that removes immobilizer data for plug-and-play installation without key programming. The product page also mentions a 'Locked ECU' option which requires professional recoding. The condition is explicitly stated as remanufactured/refurbished, and the seller emphasizes that these ECUs are thoroughly tested for reliability. Installation of replacement ECUs, especially for vehicles from 1998 and newer, can be complex due to integrated anti-theft systems. Dealerships often have tools locked by manufacturers preventing the installation of used modules. It is crucial for buyers to verify installation procedures with a qualified technician or locksmith who possesses the necessary tools and knowledge for their specific vehicle application. The seller notes that they are unable to answer installation-related questions. Furthermore, some variants, like the Immo-OFF ECU, may display error messages on the dashboard depending on the vehicle type and model, and are recommended for racing purposes.