A method of fixing a functional component (2) in a housing (4). During a first step, a first housing portion (1) is prepared in which a functional component (2), to be fixed, is arranged in a provisional fixing position. During a second step, a second housing portion (3) is brought into contact with the first housing portion (1) so that the functional component (2) is arranged in a joining direction (X) between the housing portions (1, 3). During a third step, material from at least one of the housing portions (1, 3) is melted in such manner that the functional component (2), located between the housing portions (1, 3), is gripped in position when a material-integral bond is formed between the housing portions (1, 3).