A method for manufacturing a sensor for a motor vehicle. The method includes the steps of placing leads on a support, positioning a mold, injecting overmolding material into the mold so as to obtain a sealing housing comprising a body and a hatch, the hatch being formed adjacently to the belt in the plane of the lower face of the body by being connected to the joining lateral face by at least one portion of overmolding material, called “connecting portion”, removing the mold, applying a force to the hatch in order to insert it by sliding and close the lower face of the sealing housing, filling the internal space of the sealing housing with a sealing gel in order to seal the leads, and externally overmolding the entire sensor.