Abstract: A lambda module for motor vehicle catalytic converters includes a module housing having a mount supporting a hybrid module and inserted electrical contacts. A receptacle is provided in the module housing to receive a mating plug. The mount supporting the hybrid module is a frame that engages the hybrid module at its circumference. The frame holds the hybrid module so that the hybrid module is accessible from its top in an unassembled state. A cap is mounted on the frame in an assembled state surrounding the hybrid module in a sealing manner and locked to the remainder of the module housing.