Various embodiments may include a method for producing an ultrasound sensor to detect the filling level and/or the temperature of a fluid in an internal combustion engine comprising: arranging an electronics system of the ultrasound sensor in an injection molding die; and encapsulating the electronics system by injection molding with a thermoplastic material and thereby forming a housing for the electronics system; and removing the encapsulated electronics system from the injection molding die. The housing includes a functional section to fulfill a predetermined function.