Genuine OEM Volkswagen Control Unit, part number 03L906018GN. This is the main electronic control module for the diesel engine, managing various operational parameters. It is typically located in the engine bay. The unit has dimensions of 0.205m x 0.18m x 0.04m and weighs 0.88 kg. Its precise calibration ensures optimal performance and emissions control. Genuine OEM parts guarantee correct firmware and sensor calibration.